I am trying to have excel look at numerous conditions an return a specific number. I have been able to use SUM IFS but have hit a snag. The condition I am trying to apply is whether the number in column on given Sheet (SHEET1'A1:A100) matches the number in my reference column on a separate sheet (Sheet2'B1:B100); assuming it does, I want to return the number from my sum range...what I am struggling with is if that if (SHEET1'A1:A100) is blank, and only if its blank, i want to then look to (Sheet1'C1:C100) and reference that in turn to (Sheet2'B1:B100). Thanks for any help.