Question : Access 2007 Subtract Multiple Values in Report

I am writing an Access program to help us manage our production schedule. I am assembling many tables (parts, Orders, Line) in a report to show our real production demand. I basically need help on taking (Complete Qty) and subtract it from every demand of the order. I know it is a basic subtraction formula.
Basically what i need is CompQty-Line 1 = X
then
X- Line 2 = New X
New X - Line 3 = etc etc etc.
when there is no more ComQty stop.

I dont know how to handle multiple Line demands.

HELP

Code Snippet:

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=([comp]-[Qty per SS]*[Qty]) Comp = Complete Qty Qty per SS = Quantity per Ship Set PER LINE Qty = order Qty PER LINE [Qty per SS]*[Qty] = Real Production Demand for this line

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Answer : Access 2007 Subtract Multiple Values in Report

Whatever you defined this as:

Global reportCount As Integer

open the open event of the report, try this:

reportCount = 0