What it sounds like you are doing is summing the final totals for the report, such as a summary page printed up front, or to be used for aggregates to calc final percentages, etc.

An approach I have done is what you have, but a step further.

From your preliminary cursor grouping, I would select a SUM(), COUNT(), AVG(), or whatever else with NO grouping into respective total column names in a C_ReportTotalsCursor.

Then, in the report, refer to C_ReportTotalsCursor.MySummaryField

Then, when the report is done, close the cursor and your all set.