A: 

I think you're right with cascading if I understand you properly, ASP.Net/AJAX example here:

http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/CascadingDropDown/CascadingDropDown.aspx

Meff
Guess Google is failing me thanks to everyone and their mother trying to get all the hits they can by putting anything and everything in their tags/descriptions. :(Thanks for the above. Guess I was spot on with Cascading. Guess I'll work on searching with it refined a bit more.
JClaspill