Try this:
=SUMIF(B1:B100,"x",C1:C100)
Is that something you can work with?
--------------------------
Regards,
Ron
Microsoft MVP (Excel)
(XL2003, Win XP)
> How do I tell Excel to only add amounts in column C if they have been
> flagged with an "X" in the adjacent column B?
>
> TIA
=SUMPRODUCT(--(B1:B100="X"),(C1:C100))

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