Excel 97 - Sum filtered list with creiteria

B

Ben

Hi

I have the following formula for summing a filtered list based on certain
criteria....

=SUMPRODUCT((Date7)*(SUBTOTAL(3,OFFSET(Resource_Group,
ROW(Resource_Group)-MIN(ROW(Resource_Group)),,1)))*(Resource_Group="On-Site
Engineers")*(Work_Type<>"Previous
Demand")*(Work_Type<>"Booked")*(Work_Type<>"Allocated")*( LEFT(Work_Type, 7)
<>"Actual ")*( LEFT(Work_Type, 9) <>"Capacity "))

My problem is, I have *lots* of similar formulas in my spreadsheet and it is
incredibly slow. Is there a way of speeding this up? I have had a go at
writing an XLL add-in, but the documentation for doing so is poor. For
example, I can't find a way of finding if a particular cell is filtered or
not. I'm not sure doing it this way would speed it up anyway.

Any other good ideas would be a great help.

TIA
Ben
 

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