That didn't work. It gave an error.
textboxa = tboxPercofComp
textboxb = UnitPrice
textboxc = ExtCost <--sums up a * b = c
At the bottom of the form page is a textboxd = extcosttotal
this should sum up all the ExtCost text boxes, but like you mentioned
since it's not on a record of any kind it shows up as a blank, but
since I put =Sum(Nz([ExtCost],0)) it shows up as 0. I did what you
mentioned for the extcosttotal text box and put =Sum(tboxPercofComp*
UnitPrice) but this gave me an error.