how can I add a value to an existing value?

[Guest]

Hi;

I have to manage a stationary stock in office and i want to have a form
showing me the current quantity in stock of each product.( When I receive it
should add the quantity received and when i get out from the stock it should
decrease the quantity taken.
Thank you

 

[Ed Robichaud]

One of the templates that ship with Access is Inventory Control. You can
modify that to your needs, or borrow the elements that you need for your own
app.
-Ed