# Attach DGN Underlay Dialog Box [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [03 Dialog Boxes](Help%20System/GSTARCAD/2022/Commands/03%20Dialog%20Boxes/(Dialog%20Boxes).md) ## Function Description: Names, locates and defines the insertion point, scale and rotation when inserting a DGN Underlay.  **Dialog Box Options:** ## **Name** Identifies the DGN file you have selected to attach. ## **Browse** Opens the Select Reference File dialog box. ## **Select a design model from the DGN file** Displays all of the design models that are found in the DGN file. If the DGN file only contains a single design model, that model is listed. If the DGN file contains multiple design models, only a single model can be selected for attachment. The first model in the list is selected by default. ## Conversion Units Matches the DWF file's drawing units to the master units and sub-units specified in the DGN file. For example, if the DGN file has master units set to meters and sub-units set to millimeters and you want the DWG to be set to millimeters, select sub-units in the Attach DGN Underlay dialog box. - **Master Units:** Matches the DWG drawing units to the master units set in the DGN file. - **Sub Units:** Matches the DWG drawing units to the sub-units set in the DGN file. ## Path Type Selects the Full path, Relative path and No path to the DGN file. The default path type is Relative path. ## Insertion Point Specifies the insertion point for the selected DGN file. Specify On-screen is the default. The default insertion point is 0,0,0. - **Specify On-screen:** Directs input at the Command  prompt or the pointing device. If Specify On-screen is cleared, enter the insertion point in X,Y and Z. - **X:** Sets the X coordinate value. - **Y:** Sets the Y coordinate value. - **Z:** Sets the Z coordinate value. ## **Scale** Specifies the scale factor of the selected DGN underlay. - **Specify On-screen:** Allows you to input at the Command prompt or the pointing device. If Specify On-screen is cleared, enter a value for the scale factor. The default scale factor is 1\. - **Scale Factor Field:** Enters a value for the scale factor. The default scale factor is 1\. ## **Rotation** Specifies the rotation angle of the selected DGN underlay. - **Specify On-screen:** If Specify On-screen is selected, you may wait until you exit the dialog box to rotate the object with your pointing device or enter a rotation angle value at the Command prompt. - **Angle:** If Specify On-screen is cleared, enter the rotation angle value in the dialog box. The default rotation angle is 0\. ## Show Details/Hide Details Displays the DGN file path. - **Location:** Displays the path where the DGN file is located. - **Saved Path:** Displays the path that is saved with the drawing when the DGN file is attached. The path is dependent upon the Path Type setting.