I have a PO form that uses portals for each line item on the purchase order. I'd like to come up with a way to total the extended price field from each line. The extended price field is itself a calculation of quantity x item price. So, let's say I have a portal with 3 lines and at the end of each line is an "extended price." I'd like a calculation at the bottom of the page that totals the sum of all the portal's extended price fields in this particular record.
Suggestions on how to accomplish this?