You could also create a variable to do your summary then display that variable's value at the end of your report. Here's an example:
Assume the formula you want to summarize is MyFormula
We'll name the variable SumOfMyFormula
You need to create another formula that will reside in the same band of the report as MyFormula. In that new formula, you need the following:
<Begin Formula Text>
Shared Numbervar SumOfMyFormula;
SumOfMyFormula := SumOfMyFormula + MyFormula
<End Formula Text>
Then at the end of your report, you'd create another formula with the following text:
<Begin Formula Text>
Shared Numbervar SumOfMyFormula;
<End Formula Text>
Some may question my use of Shared vs Global, I've had difficulties using Global and Shared has always worked, hence my use of Shared ;P
Hope this helps
dw