You have a lot going on here and since I don't have a scanner to see what happens if I change something I'm going to play it safe.
If you click on the manage inventory button and choose to Add/Update records, as you know if something exists it brings up the description and gives you a quantity. I noticed you can change that quantity if you like. So if you change the quantity to something less than it already was and press the button will get a message telling you that you are subtracting whatever the difference is.
So if the amount was 500 and you change it to 400 you get a message box saying you are subtracting 100 and when you click update the quantity will change to 400 and on the second sheet you will get the information you asked for.
I will post the code with the changes I made highlighted, and the workbook so that you can test it out. Don't test it on your actual inventory until you have tested it on the attached file and are happy with it.
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