Lookup total and subtract with VLOOKUP

[TimmyTom]

Hello, I hope someone can help me. this has been driving me crazy for a few weeks.

I have 2 sheets, one named inventory and another named orders. on the orders sheet I want to be able to do a vlookup to the inventory tab and display the qty in stock, but then if the same item is listed on another order on the orders sheet I need to deduct the qty that was already displayed. The orders sheet has multiple orders with different order ID's with the same product.

I'll try to break it down a little simpler using people (SKU) and colored balls (qty of Inventory):

PEOPLE (SKU)
Mike
Sally
Tom


Colored Balls (Inventory with QTY)
Red Ball 150
Blue Ball 100
Green Ball 200


So, Order ID1 has the following People(SKU) and Colored Balls (QTY)
Mike 25 Red Balls (this would leave 125 Red Balls)
Sally 20 Blue Balls (this would leave 80 Blue Balls)
Tom 30 Green Balls (this would leave 170 Green Balls)

The next Order ID is ID2 and has the following People(SKU) and Colored Balls (QTY)
Mike 30 Red Balls (this would leave 95 Red Balls)
Sally 45 Blue Balls (this would leave 35 Blue Balls)
Tom 50 Green Balls (this would leave 120 Green Balls)

So as you can see the same people order the same items just different qty on different orders. how do I get a this to translate using a formula so that it keeps a running total of the qty already ordered. I can get it to show me the QTY of colored balls but I have not been able to subtract how many balls are being ordered if the SKU is showing up on multiple orders

thanks for helping.

 

[oldbrewer]

[TABLE="width: 1152"]
<colgroup><col span="18"></colgroup><tbody>[TR]
[TD="colspan: 2"]PEOPLE (SKU)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Mike[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Sally[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Tom[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[/TR]
[TR]
[TD][/TD]
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[TR]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 4"]Colored Balls (Inventory with QTY)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 2"]Red Ball 150[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
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[TD][/TD]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 2"]Blue Ball 100[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 2"]Green Ball 200[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[/TR]
[TR]
[TD][/TD]
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[/TR]
[TR]
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[/TR]
[TR]
[TD="colspan: 8"]So, Order ID1 has the following People(SKU) and Colored Balls (QTY)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Mike 25 Red Balls (this would leave 125 Red Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Sally 20 Blue Balls (this would leave 80 Blue Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Tom 30 Green Balls (this would leave 170 Green Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 9"]The next Order ID is ID2 and has the following People(SKU) and Colored Balls (QTY)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Mike 30 Red Balls (this would leave 95 Red Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Sally 45 Blue Balls (this would leave 35 Blue Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="colspan: 6"]Tom 50 Green Balls (this would leave 120 Green Balls)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
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[TD][/TD]
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[/TR]
[TR]
[TD][/TD]
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[TR]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]red[/TD]
[TD="align: right"]150[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
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[TD]blue[/TD]
[TD="align: right"]100[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
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[TD]green[/TD]
[TD="align: right"]200[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]red count[/TD]
[TD]blue count[/TD]
[TD="colspan: 2"]green count[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[/TR]
[TR]
[TD]order[/TD]
[TD]ballcolor[/TD]
[TD]qty[/TD]
[TD]prev qty[/TD]
[TD]new qty[/TD]
[TD="align: right"]0[/TD]
[TD="align: right"]0[/TD]
[TD="align: right"]0[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[/TR]
[TR]
[TD]id1[/TD]
[TD]red[/TD]
[TD="align: right"]25[/TD]
[TD="align: right"]150[/TD]
[TD="align: right"]125[/TD]
[TD="align: right"]1[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
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[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]id1[/TD]
[TD]blue[/TD]
[TD="align: right"]20[/TD]
[TD="align: right"]100[/TD]
[TD="align: right"]80[/TD]
[TD="align: right"]0[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD][/TD]
[/TR]
[TR]
[TD]id1[/TD]
[TD]green[/TD]
[TD="align: right"]30[/TD]
[TD="align: right"]200[/TD]
[TD="align: right"]170[/TD]
[TD="align: right"]0[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="colspan: 3"]when id3, red is entered[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]id2[/TD]
[TD]red[/TD]
[TD="align: right"]30[/TD]
[TD="align: right"]125[/TD]
[TD="align: right"]95[/TD]
[TD="align: right"]2[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="colspan: 3"]the previous quantity is found by[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]id2[/TD]
[TD]blue[/TD]
[TD="align: right"]45[/TD]
[TD="align: right"]80[/TD]
[TD="align: right"]35[/TD]
[TD="align: right"]0[/TD]
[TD][/TD]
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[TD][/TD]
[/TR]
[TR]
[TD]id2[/TD]
[TD]green[/TD]
[TD="align: right"]50[/TD]
[TD="align: right"]170[/TD]
[TD="align: right"]120[/TD]
[TD="align: right"]0[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="colspan: 5"]=OFFSET($F$30,MATCH(F38-1,$F$31:$F$37,0),-2)[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]id3[/TD]
[TD]red[/TD]
[TD="align: right"]15[/TD]
[TD="align: right"]125[/TD]
[TD][/TD]
[TD="align: right"]3[/TD]
[TD][/TD]
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[/TR]
[TR]
[TD]id3[/TD]
[TD]blue[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="colspan: 6"]clearly new quantity is previous quantity minus the number (15)[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]id3[/TD]
[TD]green[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
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[TD]in C38[/TD]
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[TD="colspan: 3"]just repeat for blue and green[/TD]
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[/TR]
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[TD="colspan: 5"]the 1 in the red count column is obtained by[/TD]
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[TR]
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[TD="colspan: 4"]=IF(B32="red",MAX($F$31:F31)+1,0)[/TD]
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</tbody>[/TABLE]