subreport

Hi,
I have to display a subreport for each product group and also for each shape in the product group.
is it possible to groupby two fields? coz the whole report has to be grouped by "product Group" and the details has to be grouped by "Shape". ie, if there r 2 product groups, and pdtgrp1 has two shapes, the same report has to be for shape too..how do i do this?? is this possible??
is it possible to do it in c1report??
Regards,
Suguna