GST set-off working

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PFA the working of GST set off. huh??

Ben, I think OP means off-set payments, as in, "this" payment can by offset (in whole or in part) by "that" income - in which case, the heading is fine the way it is
(Also, I think GST = General Sales Tax???)

lalaarif1 can you confirm my assumptions please, and also, explain in words, how you would do all this manually - what are the rules that you follow?

In the event that you are looking for a single formula per row:
Row 20: =IF(C13>0,MAX(SUM(C13:C15),0),IF(C13<0,MIN(SUM(C13:C15),0),0))
Row 21: =IF(C14>0,MAX(SUM(C13:C14),0),IF(C14<0,MIN(SUM(C13:C14),0),0))
Row 22: =IF(C20<>0,0,IF(C15>0,MIN(SUM(C13:C15),C15),IF(C15<0,MAX(SUM(C13:C15),C15),0)))
Let us know if you have any questions.