I want to sum numbers over a six month period, but have the start month of six month period be changeable in another cell.
I've attached an example of what I mean.
The cell that specifies the start month is A3.
If A3 says Jan-15, I would like to sum from Jan-15 to Jun-15, and get an answer of 2287.
If A3 says Aug-15, I would like to sum from Oct-15 to Mar-15, and get an answer of 2568.
I can think how to use index/match to get the start month, but I don't know how to put this in a sum formula.
Thanks
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