you can use my favorite variables or DBlanks running totals, they will both get you there.
variables use 3 formulas normally
1) in the group header to reset
shared numbervar aVar :=0;
"" // to hide the 0
2) in the details to increment
shared numbervar aVar;
if {table.field} < 0 then
aVar := aVar + {table.field};
//up to you what to display, you can display the field, the total, or nothing
3) in the footer to display the results
shared numbervar aVar
where exactly these go, is up to use, I put the typical location that they occur, but you might not need to set to 0, if the formula is accumulating for the entire report. You may not need the final display if you are displaying the running total, so it is up to you.
HTH
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