Mmm.. I'd have said "take a read of the DW2 link in my signature, section: creating a form to search data"

Then you just make X number of parameterized queries for X number of combos, and call them in succession whenever a user picks one entry

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"it's a fax from your dog, Mr Dansworth. It looks like your cat" - Gary Larson...DW1: Data Walkthroughs 1.1...DW2: Data Walkthroughs 2.0...DDS: The DataSet Designer Surface...ANO: ADO.NET2 Orientation...DAN: Deeper ADO.NET...DNU...PQ