Hi,
in a pivot table I need to customize grand total calculation. Is it possible programatically in VBA? What I need is to calculate MARGE:

Revenue BusCat1 10 12 34 54 43 21
         OEF 10 13 35 10 01 02
         SUBTOTAL 20 25 69 64 44 23

Cost BusCat1 12 12 32 22 23 32
         Constract 02 03 10 13 14 10
         OEF 15 12 20 10 10 02
         SUBTOTAL 29 27 64 45 47 44

Marge -9 -2 05 19 -2 -21

Grand Total is possible, but only as a sum, not minus.
Thanks for help, im really hopeless.