It's very difficult to tell from your streamlined workbook what is pertainent but here's an example of how SUMPRODUCT might work.
The SUMPRODUCT Function can be used to sum 1 column based on criteria in other columns (I believe that Excel 2007 has a SUMIFS Function that does the same thing). It can do this because the criteria will be simplified as true/false and excel can be made to see the true/false as 1 or 0 respectively. The formatt is as follows
So if the date you are interested in is in Column C (From C2:C100) and you want the April Dates that expression would be
Then lets say you want Column G to be Shop Equipment
And your final expression, Assuming you want to sum $ in column F
ChemistB
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