You will at least need the following: Customer, Population, ShareAssign ( iobviously you can change these names )
Population is your current table that you have imported from Excel.
ShareAssign is a join table. It should contain the CustomerID and the PoulationID unique IDs.
I will pay someone 40$ an hour to help me through a gotomeeting today... 239-887-0213 this is an easy project!!!!