>For some reason the solution is eluding me so I ask with extreme thanks (also please forgive the possibility that the answer is just running away from me):
>

>Office   Month  Sales   Receipts   Gross-%
>1        1      100000  40000      40%
>1        2      110000  41000      37%
>2        1      500000  100000     20%
>2        2      520000  110000     21%
>

>For each line there is a net collection percentage of Receipts / Sales.
>
>On the group footer for Office, I am drawing a blank on how to create the same group footer total of Receipts / Sales in that group footer?
>
>Thanks in advance.
>--rab

You would need to create two report variables

nSalesTotal and nReceiptsTotal with reset on group and Sum option checked. Then you would just use these two variables.