I am trying to create a cumulative sum and I am using the below formula. I have NULL values for some months and would like to see the last value available (ie the current cumulative sum and not 0). The goal is that after I have at least 1 quantity, all of the subsequent months will have a value and not be NULL. Attached is my result set. Thank you.
RangeSum(Before(TOTAL Sum([Quantity]), 0, ColumnNo()))