Combined meassure

[simonak]

Hello,

I have this data here in excel. I would like to calculate Calculated Storage.
My data looks like this
Demand, Supply, Storage (days). For february (D8) , I would like the calculation to be

Calculated Storage = Storage + Supply - Demand,

but the trick is that for all subsequent months, I would like the calculation to change to
Calculated Storage = Previous Month Calculated Storage + Supply - Demand.

Any ideas how to do this?

[lbendlin]

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