Blocks and external references

In this exercise, you will create a Block such that you have Layer control of the Block once created. You will do this by setting the objects making up the Block on Layer 0.

1. Open acad-blk-xref-begin.dwg
2. Set Current Layer = 0
3. Ribbon > Home tab > Draw panel > Circle
   1. Draw a Circle
      1. Radius = 15±
   2.  Ribbon > Home tab > Draw panel > Polyline
      1. Draw a Polyline within the circle at its quadrants using quadrant Osnap.

4. Ribbon > Insert tab > Block panel > Create

   Info: bl is a command line "alias" that also invokes the block command.

   1. Name = test

   2. Base Point

      1. Specify on-screen = unchecked

      2.  Pick point

         1. Use Osnaps to specify center of Circle

   3. Settings

      1. Block unit = unitless

   4. Objects

      1. Specify on-screen = unchecked

      2. Convert to block = filled

      3. Select objects

         1. Select Circle and Polyline

         2. enter

   5. Behavior

      1. Annotative = unchecked

      2. Scale uniformly = checked

      3. Allow exploding = checked

   6. OK

   

5. Select test Block
   1. Properties palette > General
      1. Layer = E_ALI_Marker
      2. Observe Layer properties take effect
      Info: In order to have Layer control of a Block Reference, the objects included in the Block must be placed on Layer 0. The Block itself can then be placed on any Layer as needed and the Layer properties will take effect.

In this exercise, you will create a Block such that you do not have Layer control, then edit the Block so that you do have Layer control. You will also learn how to add a Block Attribute, which is a text object contained in the Block whose properties are protected and whose content value can be edited in a user-friendly interface. When you insert an Attributed Block into a drawing, you will be prompted to enter specific information for the attribute content. Block Attributes are a great way to ensure that necessary text information is entered and that it is in the correct format. In the process of completing this exercise, you will take an introductory look at the Block Editor interface.

1. Continue working in acad-blk-xref-begin.dwg
2. Current Layer = E_ALI
3. Ribbon > Home tab > Draw panel > Circle
   1. Draw a Circle
      1. Radius = 15±
   2. Ribbon > Home tab > Draw panel > Polyline
      1. Draw a Polyline within the circle at its quadrants using quadrant Osnap.
4. bl enter
   1. Name = test2
   2. Base Point
      1.  Pick point
         1. Use Osnaps to specify center of Circle
5. Objects
   1. Select objects
      1. Select Circle and Polyline
      2. enter
6. Select test2 Block
   1. Properties palette > General
      1. Layer = E_ALI_Marker
      2. Observe Layer properties not taking effect
      Info: If a Block has been created such that you do not have Layer control, you can enter Block Editor and place the objects contained in the Block on Layer 0. Then you will have Layer control of the Block.

7. Ribbon > Insert tab > Block panel > Edit

   Info: Two alternative ways to open block editor is by simply double-clicking on the block on choose it from the list, or by right-clicking and selecting edit block.

   

   1. Block to create or edit = test2

   2. OK

      1. Select Circle and Polyline

         1. Properties > General

            1. Layer = 0

      2. Block Editor Ribbon > Close panel > Close Block Editor

         1. Save the changes to test2

8. Observe Layer properties take effect
9.  Select test2 Block
   1. Properties palette > General
      1. Layer = E_ALI
10. Double-click test2 Block
    1. Block to create or edit = test2
    2. OK
       1. Block Editor Ribbon > Action Parameters panel > Attribute Definition
          1. Attribute
             1. Tag = Marker_ID
             2. Prompt = Enter Marker ID
             3. Default = Default ID
          2. Text Settings
             1. Annotative = unchecked
             2. Text Height = 1
          3. OK
       2. Specify insertion point of Attribute within Circle
    3. Block Editor Ribbon > Close panel > Close Block Editor
       1. Save the changes to test2
11. Ribbon > Insert tab > Blocks panel flyout > Synchronize Attributes
    1. Enter an option: Select
    2. Select test2 Block
    3. enter
12. Double-click test2 Block
    1. Enhanced Attribute Editor > Attribute tab
       1. Value = 12345
       2. OK

In this exercise you will learn to insert a Block from the definition stored in the current drawing. You will also learn two methods to reset a Block insertion point in Block Editor.

1. Continue with acad-blk-xref-begin.dwg

2. Ribbon > Insert tab > Block panel > Insert dropdown > Recent Blocks 
   1. Click test2 block
      1. Insertion point = checked
      2. Uniform Scale = unchecked
         1. value = 1
      3. Rotation = unchecked
         1. value = 0
      4. Drag and drop block test2 into Model Space.
         1. Edit Attributes
            1. Enter Marker ID = 6789
         2. OK
3. Block Editor opens automatically
   1. Select all block objects
   2. m enter
      1. Specify base point: bottom quadrant of circle
      2. Specify second point: 0,0 enter
      3.  
   3. Block Editor Ribbon > Close panel > Close Block Editor
      1. Save the changes to test2
      2. Notice grip edit has moved to lower quadrant of circle.
4. be enter
   1. choose test2 from list
      1. OK
   2.  Block Editor Ribbon > Action Parameters panel > Basepoint
      1. Select the center of the circle using Osnap.
   3. Block Editor Ribbon > Close panel > Close Block Editor
      1. Save the changes to test2
      2. Notice grip edit has moved to the center of circle.

The WBLOCK command will write a Block Definition based on either existing Blocks or objects in the current drawing or the entire current drawing to a new, external drawing. This workflow is commonly used to write an entire drawing that has become corrupt to Block in order to leave behind those elements causing the corruption. This Block can then be inserted into a new drawing created from the appropriate template.

1. Continue with acad-blk-xref-begin.dwg

2. wblock enter

   Info: When an entire drawing is written to a Block Definition using WBLOCK, the insertion point for the newly written Block will be at the same location relative to the newly written Block objects as the 0,0 coordinate in the original drawing was to the original drawing objects.

   Tip: In the case where WBLOCK is used to insert an entire drawing into a blank drawing started from an appropriate template in order to leave behind corruption, the Insertion point: Specify on-screen option is typically unchecked. This way the objects in the original drawing and the Block inserted into the new drawing will be a the same coordinates. Additionally, the Explode option is typically checked. This way the newly inserted Block is automatically broken down to the level of the objects in the original drawing,

   1. Source = Entire drawing

   2. Destination

      1. File name and path: ...

         1. Browse to folder containing acad-blk-xref-begin.dwg

         2. File name = new block.dwg

         3. Save

   3. Insert units = unitless

   4. OK

   5. Include AutoCAD Map information in the export?

      1. No

3. Ribbon > Insert tab > Block panel > Insert
   1. Recent blocks:
      1. Choose new block and drag into Model Space
4. x enter for explode
   1. select new block
      1. enter
      2. Notice that the block has been exploded into the two blocks contained within new block. This is called a nested block.

5. Windows File Explorer
   1. Browse to folder containing new block.dwg
   2. Select new block.dwg
      1. Drag and drop into Civil 3D drawing area
6. Specify insertion point near other drawing objects
   1. Enter x scale factor <1>:
      1. enter
   2. Enter y scale factor <use x scale factor>:
      1. enter
   3. Specify rotation angle <0>:
      1. enter

In this video you will how it is possible to purge Block Definitions if they are not currently inserted into the drawing are or referenced by Civil 3D or AutoCAD Styles. You will then use the Add Marker Symbols tool located on the Ribbon WisDOT Standards tab to bring those Block Definitions back into the drawing. The Add Marker Symbols tool can be used to add the standard WisDOT Marker Blocks into any drawing regardless of whether that drawing ever had those Block Definitions or not.

1. Open acad-blk-xref-01.dwg
2. Delete all blocks in Model Space.
3. Ribbon > Insert tab > Block panel > Insert dropdown 
   1. Observe test, test2 and new block listed.
   2. Choose block A/C
      1. Insert block into Model Space.
4. Ribbon > WisDOT Sheets tab > Standards Components panel > Block Symbols
5. Ribbon > Insert tab > Block panel > Insert dropdown
   1. Observe many new blocks in the list.
6. Ribbon > Insert tab > Block panel > Insert dropdown > Recent blocks
   1. Switch to Current Drawing tab in Blocks palette
   2. Select block ZOR
      1. Insertion Point = checked
      2. Place block in Model Space.
7. Delete all blocks in Model Space.
8. Verify that all block definitions still exist in the Insert dropdown list.
9. PU enter to run the purge command.

   1. Items not used in drawing

      1. select Blocks

   2. Purge Checked Items

   3. Purge All Checked Items

   4. Notice blocks test and test2 now show up in the purge list. This is because these were nested blocks within the new block definition. Once new block was purged, these two block definitions were added to the drawing.

      1. Repeat the above steps to purge test and test2

         Info: Alternatively, the option purge nested items could have been checked in order to remove test and test2 since these were nested blocks.

      1. Close

   

10. Ribbon > Insert tab > Block panel > Insert dropdown

    1. Observe ZOR, test, test2 and new block not listed

11. Ribbon > WisDOT Sheets tab > Standards Components panel > Block Symbols to add all WisDOT block definitions back into the drawing.
12. Ribbon > Insert tab > Block panel > Insert dropdown

    1. Observe ZOR listed

In this exercise you will explore options to insert a Block Definition from an external drawing when it is not available through the WisDOT contextual tabs. You can either insert an entire external drawing using the INSERT command or pick which Block(s) to insert from an external drawing using the Design Center interface.

1. Continue working in acad-blk-xref-01.dwg
2. Ribbon > Insert tab > Block panel > Insert dropdown
   1. Select new block
   2. Specify insertion point anywhere in drawing area
3. i enter
   1. Drag and drop new block from the Blocks palette.
4. Delete the blocks placed in above steps.
5. Purge enter
   1. Items not used in drawing
      1. select Blocks
   2. Purge Checked Items
   3. Purge This Item
   4. Repeat the above steps to remove the block definition test which was a nested block.

   

6. Ribbon > Home tab > Palettes panel flyout > Design Center

   Info: dc is a command line "alias" that also invokes the Design Center palette. Alternatively, ctrl + 2 will also open Design Center.

   1. Folders tab > expand Folder list to new block.dwg

   3. Select Blocks
   4. Drag and drop test2 into drawing area

   Info: Another way to insert a block is to right-click on the block in Design Center, and choose Insert Block. All insert options can be modified in the resulting Insert dialog box.

    

7. Edit Attributes
   1. Enter Marker ID: WisDOT
   2. OK

The topography Blocks used as Point Markers in Civil 3D Point Styles can be found and inserted directly as Blocks into any drawing through the WisDOT Topo Tool Palette, which is found on the WisDOT Sheets contextual Ribbon. The Blocks inserted from these Tool Palettes are defined in external source drawings that install with the WisDOT Standards package.

1. Open acad-blk-xref-02.dwg
2. Ribbon > WisDOT Sheets
   1. Sheet Creation Components panel > Topo
   2. Tools panel > Palettes ON/OFF
      1. Topo Tool Palette > BuildingFencesTrees tab
         1. Tree Stump
            1. Specify insertion point near other drawing objects
3. Select STMP Block
   1. Properties palette > General
      1. Layer = E_LAND_Vegetation
4. Select STMP Block
5. Ribbon > Home tab > Layers > Make Current

When a Block is inserted into a drawing it will be automatically scaled by a factor based on the drawing Insertion Units and the individual Block Units. The scale factor applied to a Block upon insertion will represent the Block in terms of the drawing Insertion Units. For example, a Block with Block Units of "inches" and a length magnitude of 24 that is inserted into a drawing with Insertion Units of "feet" will be scaled by a factor of 1/12 and will be have a length magnitude of 2 after insertion. Both the Insertion Units and the Block Units must be set to a value other than "unitless" in order for this form of automatic scaling to take place. If either is set to unitless in the source drawing, the Block will come in with the same length quantity as that in the source drawing.

1. Continue working in acad-blk-xref-02.dwg
2. Select STMP Block
3. Properties palette > Misc
   1. Observe Block Unit = Unitless
   2. Observe that this field is not editable here
4. BE enter

   1. Block to create or edit = STMP

   2. OK

   3. Properties palette > Block

      1. Units = Inches

   4. Block Editor Ribbon > Close panel > Close Block Editor

      1. Save the changes to STMP

         Warning: The Blocks included in the WisDOT Tool Palettes and various Templates should not be edited by the end user. This training module exercise is intended to teach you general Block behavior. You may need to edit Blocks coming from outside of WisDOT, however.

5. units enter
   1. Units to scale inserted content to: feet
   2. OK

6. i enter
   1. drag and drop the STMP block into Model Space.
   2. Select the block and open the Properties palette.
      1.  Misc
         1. Observe Unit factor = 0.0833
      2.  Geometry
         1. Observe Scale = 0.0833
      3. esc
   3. Select the first block that was placed in the exercise and open the Properties palette.
      1.  Misc
         1. Observe Unit factor = 0.0833
      2.  Geometry
         1. Observe Scale = 12
      3. esc

7. Topo Tool Palette > BuildingFencesTrees tab

   1. Tree Stump

      1. Specify insertion point near other objects

      2. Observe lack of automatic scaling

      Info: When a Block is inserted from an external Block Definition, such as the source drawing used by the WisDOT Topo Tool Palette, the Block will scale based on the units in that external source drawing even if the Block Definition in the current drawing has been edited to have different Block units. To avoid this, the Block Definition in the source drawing would need to be edited.
8. Topo Tool Palette > BuildingFencesTrees tab
   1. Right-click Tree Stump
   2. Redefine
   3. Select the smallest block and open the Properties palette.
      1.  Misc
         1. Block Unit: Unitless
         2. Observe Unit factor = 1
      2.  Geometry
         1. Observe Scale = 0.0833
      3. esc
   4. Select one of the larger blocks and open the Properties palette.
      1.  Misc
         1. Block Unit: Unitless
         2. Observe Unit factor = 1
      2.  Geometry
         1. Observe Scale = 1
      3. esc
9. qselect enter
   1. Object type = block reference
   2. Properties = name
   3. Value = STMP
   4. OK
   5. Observe that X and Y coordinate *VARIES* on the Properties palette
   6. Set Scale = 1
      1. Observe that the small block is not the same size as the other 2 blocks.

The Blocks included on the WisDOT Tool Palettes can be redefined in a drawing by right-clicking on the corresponding Tool Palette button and choosing Redefine. For those Blocks not included on the WisDOT Tool Palettes, you can redefine the drawing Block Definition by browsing to the source drawing through Design Center. This exercise goes through the workflow to redefine a Block through Design Center.

1. Continue with acad-blk-xref-02.dwg
2. Select test2 Block
3. BE enter
   1. Block to create or edit = test2
   2. OK
4. Properties palette > Block
   1. Units = Inches
   2. Block Editor Ribbon > Close panel > Close Block Editor
      1. Save the changes to test2
5. i enter
   1. Drag and drop test2 into Model Space.
   2. OK
   3. Observe that this block is smaller than the one that was already in the drawing due to changing the units to inches in the block definition.
6. DC enter
   1. Folders
      1.  Browse to new block.dwg
         1. Blocks
            1. Drag & drop test2 into Model Space.
            2. OK
7. Properties palette
   1.  Geometry
      1. Observe Scale = 12

Info: In order to Insert a Block from an external source, such as through a Design Center, and have that external Block Definition update that in the current drawing, the Block in the external source drawing must be edited. Then you can browse to that Block in the external source through Design Center and redefine any instances of that Block Definition in the current drawing. This is the same functionality that is found by right-clicking a WisDOT Tool Palette button and choosing Redefine, but it applies to any Block even if it is not included in the WisDOT Tool Palette.

8. Open new block.dwg
9. BE enter
   1. Block to create or edit = test2
   2. OK
10. Properties palette > Block
    1. Units = Inches
    2. Block Editor Ribbon > Close panel > Close Block Editor
       1. Save the changes to test2
11. Application menu > SaveAs
    1. File name = new block1.dwg
    2. Save
12. DC enter
    1. Folders
       1. Browse to new block 1.dwg
          1. Blocks
          2. right-click test2
             1. Redfine only
13. qselect enter
    1. Object type = block reference
    2. Properties = name
    3. Value = test2
    4. OK
14. Open Properties palette
    1. Observe that there are 3 blocks selected in Properties palette
    2. Properties palette > Geometry
       1. Scale = 1

This exercise will walk you through the unique features included in the WisDOT Signs Tool Palette. The Blocks included on this tool palette represent the WisDOT standard signage details. These Dynamic Blocks include the ability to choose a version of each block from a dropdown list (Visibility Set) as well as a hyperlink to quickly view the associated WisDOT standard detail sheets.

1. Open acad-blk-xref-03.dwg
2. Ribbon > WisDOT Sheets tab > Sheet Creation Components panel > Signs
3.  Ribbon > WisDOT Sheets tab > Sheet Creation Components panel > Palettes ON/OFF
   1. D-Signs tab
      1. D1-51
         1. Specify insertion point anywhere in drawing area
4. Select D1-51 Block
   1. Visibility set dropdown
   2. Choose alternative Visibilty from list
   3. esc

   

5. Double-click D1-51Block
   1. Enhanced Attribute Editor
      1. Select SIZE row
      2. Value = 120"X15"
      3. OK
      4. Observe update to D1-51 Block in drawing area
6. Ctrl+click D1-51 Block
   1. Observe web browser open the WisDOT signage detail D1-51.pdf

The WisDOT Intersection Blocks and Beam Guard Tool Palattes contain dynamic Blocks which include easily editable linework to get started with your geometric layout. Insert these Blocks and use the Properties palette or dynamic Block grips to edit the linework. The WisDOT Design Ribbon tab also includes the Autodesk Palettes button. This will populate your Tool Palette with all of the default Autodesk Tool Palette tabs. Some of these default Tool Palette tabs contain default Autodesk Blocks that could potentially be useful to convey your design intentions.

1. Continue working in acad-blk-xref-03.dwg
2. Ribbon > WisDOT Design > Parametric Design panel > Intersection Blocks
   1. Int-Type-A-Q-Grtr-80-In-Curve
   2. Specify insertion point near other drawing objects
3. Select Int-Type-A-Q-Grtr-80-In-Curve Block
   1. Select Grip along incoming intersection centerline
      1. Specify point location for centerline
   2. Select Visibility Set dropdown
      1. Graphics Mode = checked
   3. Properties palette > Custom
      1. Observe editable parameters in tabulated form
   4. esc
4. Ribbon > WisDOT Design > Parametric Design panel > Beam Guard Blocks
   1. BG EAT R Right Curve
   2. Specify insertion point near other drawing objects
   3. OK
5. Select BG EAT R Right Curve Block
   1. Observe grips to edit linework geometry
   2. Properties palette > Custom
      1. Observe editable parameters in tabulated form
   3. esc
6. Ribbon > WisDOT Design > Autodesk panel > Autodesk Palettes
   1. Left-click "stacked" tabs at bottom of Tool Palette
   2. Scroll down in list
      1. Highways
         1. Scroll to explore available out-of-the-box Blocks
      2. External Works
         1. Scroll to explore available out-of-the-box Blocks

This exercise will introduce you to the External Referencing (Xref) workflow. You will create an Overlay Xref then change it to an Attach Xref and observe behavioral differences between the two. When an Xref is created as the type "Overlay", the Externally Referenced source drawing will not be carried forward if the destination drawing is then Externally Referenced into another drawing. When an Xref is created as the type "Attach", the Externally Referenced source drawing will be carried forward.

1. Open acad-blk-xref-04.dwg, acad-blk-xref-05.dwg and acad-blk-xref-06.dwg
2. File tab > acad-blk-xref-05
3. Ribbon > Home tab > Palettes panel flyout > External Reference Manager

4. External References palette > Attach dropdown > Attach DWG
   1. Browse to acad-blk-xref-04.dwg
      1. Open
5. Attach External Reference
   1. Reference Type = Overlay
   2. Insertion Point > Specify On Screen = unchecked
   3. OK
6. Ribbon > Home tab > Layers panel > Layer Properties
   1. Observe presence of Xref Layer Filters and Xref Layers

   

7. File tab > acad-blk-xref-06
8. xr enter
9. External References palette > Attach dropdown > Attach DWG
   1. Browse to acad-blk-xref-05.dwg
      1. Open
   2. Info:

      When acad-blk-xref-05.dwg is externally referenced into acad-blk-xref-06.dwg, no objects are displayed in acad-blk-xref-06.dwg. This is because the objects displayed in acad-blk-xref-05.dwg are only an "Overlay" xref of acad-blk-xref-04.dwg. "Overlay" xrefs are not carried forward when their destination drawing is then used as an xref source drawing in another drawing. "Attach" xrefs are carried forward in this manner, however.

      When acad-blk-xref-05.dwg is externally referenced into acad-blk-xref-06.dwg, xref Layers prefixed with acad-blk-xref-05 are created and are similar to the Layers in acad-blk-xref-04.dwg. This is because both acad-blk-xref-04.dwg and acad-blk-xref-05.dwg were started from the same template (wisdot16.dwt) and this template includes all of those Layers.

10. File tab > acad-blk-xref-05
11. xr enter
12. External References palette
    1. click on acad-blk-xref-04
    2. Details > Type = Attach
13. Save acad-blk-xref-05.dwg
14. File tab > acad-blk-xref-06
    1. xr enter
       1. Observe that acad-blk-xref-05.dwg needs reloading
       2. Right-click on acad-blk-xref-05.dwg and Reload.

You have three options to specify how the Xref file path relationship between the source drawing and destination drawing is defined. A Full Path Xref requires that the source drawing exist at the exact drive location called out in the destination drawing when the Xref was created. If not, the Xref source file will not be read and a notification will be displayed. A Relative Path Xref requires that the source drawing exist at the same folder hierarchy location relative to the destination drawing. In other words, the source and destination drawings must be the same number of folders away from each other in order for the Xref source drawing to be read. There is also a No Path option which requires that the path to the source drawing be included in the Civil 3D profile options support file search path list. This No Path Xref type is less common and will not be covered in this exercise.

1. Continue working in acad-blk-xref-04.dwg, acad-blk-xref-05.dwg and acad-blk-xref-06.dwg
2. Open External Reference Manager
   1. Observe full path displayed in acad-blk-xref-04 row, Saved Path column
3. File tab > Close acad-blk-xref-04
4. Windows File Explorer
   1. Browse to acad-blk-xref-04.dwg
   2. Move acad-blk-xref-04.dwg into XREF folder
5. External References palette > right-click acad-blk-xref-04
   1. Reload
   2. Observe "Not Found" displayed in acad-blk-xref-04 row, Status column
6. Windows File Explorer
   1. Browse to acad-blk-xref-04.dwg
   2. Move acad-blk-xref-04.dwg to location displayed in Saved Path column of External References palette
7. External References palette > right-click acad-blk-xref-04
   1. Reload
   2. Observe "Loaded" displayed in acad-blk-xref-04 row, Status column
   3. Right-click acad-blk-xref-04
      1. Change Path Type > Make Relative
      2. Observe partial file path displayed in acad-blk-xref-04 row, Saved Path column
8. Save acad-blk-xref-05.dwg
9. File tab > Close acad-blk-xref-05
10. Windows File Explorer
    1. Browse to acad-blk-xref-04.dwg
    2. Move acad-blk-xref-04.dwg and acad-blk-xref-05.dwg into XREF folder
11. Open acad-blk-xref-05.dwg
12. External References Manager
    1. Observe "Loaded" displayed in acad-blk-xref-04 row, Status column

Once an Xref is created in a drawing, you can insert the source objects, styles, Block Definitions and Layers through the BIND command. This will insert the source drawing content and create or merge similar content (i.e. similarly named Layers or Blocks) depending on the type of Bind you specify. In this exercise, you will Bind an Xref using both types of the Bind command and observe behavioral differences between the two.

1. Open acad-blk-xref-07.dwg
2. xr enter
   1. Attach DWG
      1. Browse to acad-blk-xref-04.dwg
         1. Open
   2. Attach External Reference
      1. OK
3. External References palette > Right-click acad-blk-xref-04
   1. Bind
   2. Bind Xrefs/DGN underlays
      1. Bind Type = Bind
      2. OK
      Info: When you Bind an Xref using the type Bind, any content in the source drawing similarly named in the destination drawing will be duplicated. That duplicated content will be named with a prefix based on the source drawing name. When you Bind using the type Insert, any content in the source drawing similarly named in the destination drawing will be merged. The version of that similar content in the destination drawing will be used.
4. Ribbon > Home tab > Layers panel > Layer Properties
   1. Observe duplicate Layer naming convention

   

5. Select all drawing objects
   1. Properties
      1. Observe selected object is a Block Reference
      2. Misc
         1. Observe name = acad-blk-xref-04
   2. esc
6. Quick Access toolbar > Undo dropdown > Xref
7. External Reference Manager
   1. Attach DWG
      1. Browse to acad-blk-xref-04.dwg
         1. Open
   2. Attach External Reference
      1. OK
8. External References palette > Right-click acad-blk-xref-04
   1. Bind
   2. Bind Xrefs/DGN underlays
      1. Bind Type = Insert
      2. OK
9. Select acad-blk-xref-04 Block
10. Ribbon > Home tab > Layers panel > Layer Properties
    1. Observe no duplicate Layers created