Hi Naga,
Let's say you have this formula in the Group Footer A section:
whileprintingrecords;
numbervar x;
If you wish to increment the value of x by 1 in Group Footer B, then create another formula and place this on the Footer B section:
whileprintingrecords;
numbervar x;
x := x + 1;
P.S: If you want that the value increments only within the group, meaning when the Group Changes then you want to start fresh, you would need to reset the value of x at the Group Header level.
Hope this helps!
-Abhilash