To Attach or Overlay Xrefs

Click Insert tab Reference panel Attach .
In the Select Reference File dialog box, open the file you want to attach or overlay.
In the Attach External Reference dialog box, select one of the following for Reference Type:
- Attachment: Saves a copy of the xref drawing in your drawing.
- Overlay: Creates a link to the xref drawing in your drawing.
Specify the insertion point, scale, and rotation angle; or click Specify On-screen to use the cursor.
Click OK, and, if necessary, specify the insertion point, scale, or rotation angle in the drawing.