Hi David,
Here's what you need to do:
1) Group the report on the Service column
2) Create this formula and place it beside the exp fields on the details section:
WhilePrintingRecords;
numbervar res;
numbervar x;
res := res + 1;
if res = 1 then
x := {exp}
else
x := x * {exp}
2) Create this formula and place it on the Group Header section:
WhilePrintingRecords;
numbervar res := 0;
numbervar x := 0;
3) Create this formula and place it on the Group Footer:
WhilePrintingRecords;
numbervar x;
4) Move the Group Name from the Group Header to the Group Footer and suppress the Details and Group Header sections.
-Abhilash