OK, i have range in a report that sums values on a seperate document dependent on certain criteria.
Now, i can't have helper columns on the source data because the source document will be overwritten every month.
My report has a year field and a month field, that increments each month and form the limit for the report, so we want to sum values where the year = the report year and the month is <= the report's month.
I have a feeling that SUMIFs may be the wrong way to go and SUMPRODUCT may be required, but i have man flu and my brain is refusing to engage with anything beyond remembering my own name....
The attached is an .xls but i am using Excel 2010.
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