Stock Count. Adding to a pile

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Jun 29, 2005
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Greetings,

I'm trying to organize my companies stock a little bit more effectively. Now I'm a rank amateur when it comes to excel.

I'm trying to get a cell that when i type a number into it it'll add to the pile. Lets say I have 200 books. I type 50 in this one cell and the pile is now 250. I click that 50 and delete it.. put in 50 more. Then I have 300 now. I also need this for subtraction.

Thanks for the help!
 
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