I have a table listing items in column 'A'. How do I keep a running total of
the individual items as they are entered. Below is an exemple of my table.

A B C D
Item Stock in Stock out Stock left

Nails 100 70 30
Clips 100 60 40

As the items are entered I wish the total in column D be kept up to date for
the individual item. Thank you.
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ASU