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Item Numbers Tab allows you to enter another item number for an existing active item in Percent POS.
When item is added, the original Item Number (UPC or PLU) cannot be edited or changed. So when there is a change in the UPC, insetad of adding a new item, you can add an Alternative Item Number.
To Add an Alternative Item Number:
Select the + at the bottom of the screen
You will receive a prompt to enter in the Alternate Item Number
You can scan or manually enter a new item number
Select the green check mark
You will now be prompted to add the Quantity (units) that are deducted each time you sell this item (by default should be 1).
Finish by selecting the green check mark