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Calculating based on a previous value when initial column values differ from the rest

Let me preface this by saying I am new to the BO world. I'm trying to build a report/chart that tracks incoming loads. The first supply on hand value is pulled from the database and each successive supply on hand is based on the previous row's values.

In the supply arriving column below, the iniital value differs from the rest using the formula:

     =If [Row Number]=1 Then [First Supply Arriving] Else [Supply Arriving]

The supply on hand uses the same idea, but is where I'm running into problems. The first column value should be [Supply On Hand], easy enough. Each successive column value needs to follow this equation:

     Previous([Supply On Hand] (this won't always be [Supply On Hand] though, only for the second row essentially - problem 1) + Previous([Supply Arriving] (same as problem 1, where this is first supple arriving for the second row and then supply arriving moving forward) - [Usage Rate]

If someone could help me in getting the calculation to pull the previous values correctly without making a ton of variables, I'd greatly appreciate it. We just upgraded to 4.1

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