SUBTOTAL IN ALV REPORT

hi guru,

my alv o/p 4 fields there, 1/order no 2/yield conformation 3/description 4 / material.

no. 2 field yield conformation field is GMNGA.

here total i got by the help of using do_sum parameter and i got also.

but my client wants ..one subtotal for all onspec mat.

and another subtotal for all offspec mat.

then grand total how to this in alv???how to sort according to the rwquirement???

thanks

subhasis