I run a small business. I want to start keeping track of inventory using a barcode system.

I know Excel "ok", but I don't know programming.'

I'd like to be able to do something very simple (for now)...

For example...if I had PRODUCT / CODE / INV VALUE

A - CODE A - 5
B - CODE B - 11
C - CODE C - 14

I would want to be able to click a button (or scan a code for) : ADD +1 or REMOVE -1

...then scan the barcode on the product (A) and have it add or remove one, respectively. So, if the row for A is:

A - CODE A - 5

I choose "ADD" (with a button or scan code), then scan the barcode, and the spreadsheet automatically finds the code in the sheet, and changes the corresponding inventory value:

A - CODE A - 6

Does that make sense? How might I go about doing that?