Distributing monthly values

[mogaka1234]

I have sales values for Jan to Dec. February value is a summation of January and February, ....December value is a summation of all the 12 months values. I need to plot month by month actual value. Please help.

[Gysbert_Wassenaar]

Perhaps like this: Rangesum(Sum(Amount),Above(sum(Amount*-1)))

[mogaka1234]

what *1?

[Gysbert_Wassenaar]

No, Amount*-1