I have a matrix in SSRS (for 2008 R2) that includes stores on the vertical axis and areas on the horizontal axis. The numbers are the sales that each store made into each area. This report is done so that each region has its own report page - only the stores from that region will show up in that group. At the bottom, I have a total that includes all the sales made into that area from any store, whether or not it is from the region. I need to add a row that has the sales that were made from stores outside the region into each area. So it would be like subtracting the sales of all the region stores from the total sales. The formula for both the store's sales into the area and the total sales into the area is the same: "=Sum(Fields!fieldval.Value)". How do I subtract the total sales from the ones in the group to get the sales from stores outside the region?
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