I have a form "PRF" that uses a subform "PartsF" within "PartsF" there are 15 line items each utilizing a lookup to a table "Inventory" which displays the Manufacturers Part Number (Inventory!Part_ID, Forms!PRF!mp1, Forms!PRF!mp2, Forms!PRF!mp3...etc.) now I'm being asked to calculate the parts on order qty by part #. I'm assuming I will have to redesign the form somehow but I'm at a mental block right now. Is there a way to perform a Dlookup or query that If Forms!PRF!mp1...mp15, find Forms!PRF!q1...q15 (quantity to order) and that number will be stored in a field in the Inventory table?
Or do I have to re-design the form?