How to Create an XREF?
by Anonymous
(United States )
Q. It has been years since I have created an XREF.
A. An XREF (external reference) is created like any other drawing file. In fact, it is a drawing file.
Instead of inserting blocks of drawings into your drawing, using XREF drawings cuts down on the space a block might take up inside your drawing, leaving you with a smaller CAD file.
To add an XREF to your drawing, simply type XREF at the command prompt and browse to the file you would like to attach or overlay.
There is a pretty good write up about XREF's here
http://www.cad-design-and-drafting-services.com/The_CAD_Times-autocad-tips-and-tricks-3.html