sum by category, by month

[KarlaJ]

I am using a summary sheet that shows dollar totals by category, by month. I
want to enter data in a second sheet for each transaction and have the
summary sheet pull the totals as data is entered ongoing.
summary sheet:
A B C
code Jan Feb etc.

Data sheet:
A B C
Month Code Amount

 

[KarlaJ]

I found my answer from the folowing site
www.xldynamic.com/source/xld.SUMPRODUCT.html
VERY HELPFUL!