Autodesk Revit MEP

[#1]

Here is a question that was asked two years ago, without an answer.  I have the same question:

I have a key plan I need to show on multiple sheets. The plan has 3 separate areas. I need to show only one area at a time. How can I accomplish this without placing a region on every sheet.

Preferably I would like to place the key plan with the separate hatches (regions?) in the titleblock family then manipulate the hatche(s) through my sheets.

[#2]

http://www.augi.com/images/uploads/aec_edge/AAE2010Sum-lr.pdf

AEC edge above contains an article on key plans by Paul Aubin.  I have seen another method where you clean up a view and do a drafting view snapshot which forms the background of your key plan then same thing with the yes/no parameters controlling visibility on fill regions.