Rather than attempt to describe my problem here and risk cofusing people on what I want to achieve I have put a diagram together. I think this is the best way to illustrate my problem.

Diagram is available here
http://uk.geocities.com/di22y@btinte...iondiagram.jpg
There is also a copy of the document available here for any body willing to take a look.
http://uk.geocities.com/di22y@btinte...m/lookhere.xls
Please bare in mind I need this doc to be compatible with the 2003 version of Excel.

Any help would be greatly appreciated.