I am designing an invoice sheet and need to have formulas that calculate what
is due. My first problem is how to populate the balance column with the
formula without the #Value showing until I actually have numbers that will
populate that row. I tried the template for invoice but I need to modify it
and then it does not work.

Second, is how to you refer to the last populated balance row in a receipt.
I cannot use the sum as then it adds all the balances. I just need the last
balance row that has a number in it.