Any help is greatly appreciated!
I have two tables like so:
Tb1:
AutoNum Agreement SubAgreement Value ValueLeft 1 Agree1 Sub1 $10 2 Agree1 Sub2 $15 X 3 Agree2 Sub1 $8 4 Agree2 Sub2 $17
Tb2:
AutuNum InvoiceNum Agreement SubAgreement AmountBilled 1 1234 Agree1 Sub2 $4 2 5678 Agree1 Sub2 $3
My question is, how do I get X in Tb1.
The value of X should be "X = $15 - $4 - $3"
[ValueLeft] needs to look at Tb2 where [Agreement] and [SubAgreement] equals [Agreement] and [SubAgreement] in Tb1 and subtract all [AmountBilled] values from [Value].
These tables are displayed in a form.