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# How do units of products that have been used in the center and not sold are discounted? Internal use product

If you want to discount units of a product for internal use that has not been sold, but has been used to perform a treatment or service, you must do the following:

Configuration > products > in the column stock you can, with the red arrow,  discount the number of units you need.

If you use warehouse, the program will give you the option to discount them each time you make a sale of services that carry related products.