If this is a straight sum then you can insert a summary (sigma sign) using the SUM for each field and set it ina group or report footer .
You can also create running totals that do the exact same thing.
perhaps it is your sample data that is confusing...?
If you are doing a sum I don't understand how
1.70 + (-1.70) = 3.40
or if you are subtracting how does
2.80 - 3.00 = .20 ?
My guess is that you are subtracting but you will need to clarify what you are doing, and if you have groups involved or if this is just one summary result for all rows in the report.
Edited by DBlank - 10 Jun 2015 at 4:33am