I feel strongly that one should be able to produce a plan in one file and then reference that file into another drawing to add layers of information or show more detail.
Unfortunately, the current Workgroup Reference function doesn't allow you to change scale, rotate or move the referenced object. Actually, you can rotate, move and change scale but all is lost as soon as the reference is updated.
And God forbid that the paper size/origin has been changed! The whole reference will land in a different spot altogether! See wish list item "Absolute, Unchanging Origin".