Newbie using Business tracker

[pius222]

FileMaker Business Tracker is a nice program, but I don't know if it is possible to do this:

FMBT has invoice and products. When I input new items in product, I get to enter my inventory in "in stock." field.

Now when I create an invoice, and input how many of this product is ordered. Can Filemaker automatically deduct the the inventory from the "in stock" field?

Thanks

Randy