Excel 2007 : Lookup/Vlookup using two Lookup values

The attached spreadsheet is a sales report (first tab) that we create with multiple customers who have multiple business lines. The second tab contains detaled data that shows payment deductions (charges) for each of those customers, by business line.

The third tab is just a pivot table showing the total charges, by customer, by business line.

I want to be able to lookup by customer number, the charge/deduction for each of the business lines. So I guess in essensce, since the cust# is not unique for each line, the lookup command has to look at the customer number AND the business line, then go over to the Pivot Table and see which charge amount matches the customer number and business line, and then return its value.

I've researched the forums, and am becoming more confused as I go.

Any help is appreciated.

Thanks!
Rick