maybe
=sumproduct((c2:c22=a1)*(o2:o220)*(o2:o22<=12)*s2 :s22)

--
Don Guillett
SalesAid Software

"paul" wrote in message
oups.com...
I am trying to sum a column ("S") based on fulfilling 2 criteria in 2
other columns (C = A1 AND O = 1, 2, 3...12). I want to do this in a
formula rather than a DSUM since my criteria changes in 2 different
ways; Column C follows a cell reference, and Column O follows months 1
- 12.

Suggestions?