Thank you so much for the tip! I reworked the formula and it worked!
=SUMIF(I4:I500,">="&(D2-(7*E2-1)),O4:O500)-SUMIF(I4:I500,">="&D2,O4:O500)
Now I have to convert all the SUMPRODUCTS to SUMIF then I will test it on my mobile devices! Thanks again to Chandoo and friends!
I have a SUMPRODUCT formula that isn't compatible with Documents to Go on my mobile devices. I have tried rewriting with SUMIF but I keep getting stuck on entering a cell reference into SUMIF. Maybe SUMIF can't take a cell reference with operands?
Here is the formula that I'm trying to...