Sorry, this was posted to the wrong group originally

I can get this info via pivot table, but there has to be a way to get sum it
via a formula. I have multiple worksheets and each has multiple rows/columns
of data. I want to use 2 different sets of criteria (from different
worksheets) to sum multiple columns of numbers in the master worksheet. I
keep getting #N/A.

{=SUM(IF(($A2=Customer!$F$1:$F$800)*($B2=Sales!$H$ 1:$H$800),Master!L$1:O$800,FALSE))}

Can anyone help?