Can the grandtotal of a crosstab be the difference of group subtotals

[padigela]

I've a cross tab with two groups on the left side.I wonder if it is possible for the grandtotal to be the difference of the 2 subtotals(subtot1-subtot2) rather than sum of them, as it does usually. Pl note the values can be negative or positive.
Any ideas??
Thanks for your help!

 

[RobertKaiserIII]

Not to my knowledge. Do you think you can get away with suppressing the Column Grand Totals in the Format Crosstab | Customize Style tab (or just suppressing the grand total lable and field cells) then inserting a formula in a section below the crosstab that works along these lines:

Sum(amount, row1) - Sum(amount, row2)