Add and subtract from another sheet

Question 1:

It sounds like you want to confirm the updating of your old stock sheet (but only for sales).

Problem you have is, you are updating your new stock by a formula using your quantity sold and quantity in stock. Then when you update the Old stock with a confirmation in VBA, your quantity in stock is updated (again by formula) which means your New stock is updated again.

I would solve this by getting rid of the formula in your New Stock column and update it with VBA (see below)

Question 2:

I have put the date in automatically for you in your code too. Don't forget to format the cells as the date format you wanr.

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PS. If you want to update Your Old stock regardless (which makes more sense to me - but I don't count) then you need to take your confirmation outside of that If statement.

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