Subsubtotal on a jasperreports

[riassuncao]

Hi, Im newbie on jasper reports and I need some help. 

I have a report with subtotals.... But I need to insert a subtotal line, and that subtotal would be the subtotal of  first subtotal plus second subtotal .. Sorry If I can't explain in a clearly way. English is not my native language.

What I need is this ...

	A	B	C
XXX	10	20	30
Subtotal 1	10	20	30
YYYY	15	40	35
Subtotal 2	15	40	35
Subtotal 1 + 2	25	60	65

But I need to do this just for first and second subtotals ... Is there a way to do this?

Thanks in advance for any help.

[hozawa]

Create a variable to hold the subtotal amount and in the group footer band for the 2nd subtotal, print that variable out under the 2nd subtotal.