I have print shop.
And I have a need to calculate the useful usage of printing roll.
For example, I know that the roll is 100meters, so if I add all printed jobs between replacements (ex.89meters), I know that my useful usage is 89%.
So I have this table with fields (order#, meters, date roll changed, #number5) where #number5 right now filled manually.
How can I replace it with formula field doing same comulative function between roll changes.