How to exclude combinations of certain lines?

[PNorm]

I have a report that is grouped twice.

At job then at task. I am trying to excluded when two fields are zero. But I get a mess of results.

A b c

GF2 task1 5 6 0
GF2 task2 0 2 0
GF2 task3 8 0 1
GF2 task4 0 7 2

GF1 Total 13 15 3

How would I excluded line only task2? When A and C are zero?

I tried at the GF2 but task(s) 1, 2 and 4 would disappear if I did " (Sum ({vdvProjectLines.numJobTRXNActlCost}, {vdvProjectLines.chrTaskNumber}) > 0
and Sum ({vdvProjectLines.numJobTRXNRvEstSal}, {vdvProjectLines.chrTaskNumber}) > 0)"


Thanks for your advice.
PN