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Row count modified by quantity


markelliscope

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OK, sorry if this one is quite simple.

I have report where the first column needs to be a number that increases by the quantity of an item in a later column.

Item NumberDescriptionQuantity 
1Speaker1 
2 - 4Cable3 
5Amplifier1 
6 - 9Power Cable4 

So the item number increases as the quantity of items increases but is a product of the item number before plus the new quantity.

Report_Count doesn't quite do it. It just gives me an incremental count of the rows.

 

Any help greatly appreciated.

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