Setting Barcode for a Product
In order to generate a Barcode for the particular product, go to Add / Edit Product form through Accounts >> Inventory Items >> Choose particular product. You should check for Show more options button. Once you click on it, additional fields such as SKU Number, UPC Number, Unit Measurement, Manufacturer, Part Number, Customer, Barcode will appear. Here, you can fill the Barcode field by entering your Barcode Number:
Then, choose the type of Barcode (small, medium, large) and click on Generate button and Save changes. Once you finish, you can download the generated barcode.