To Detach an Underlay

1. Click Insert tab Reference.
2. In the External References palette, in the File References pane, select the underlay you want to detach.
3. Right-click on the underlay and click Detach.

   The underlay is no longer linked to the drawing file. All instances of the underlay are removed from the drawing.

Note:

Erasing an individual instance of an underlay is not the same as detaching it. An underlay must be detached to remove the link from your drawing to the file.