Click on the System Tools Menu and choose the Print Barcodes option. This will bring you to a menu with the following options:

Enter From Keyboard
Print Product ID's
Print Inventory Labels
Print Barcode Book
Setup Barcode Format

Choose Enter From Keyboard if you want to manually enter a barcode.

Choose Print Product ID's if you want to print a specific product or a range of product barcodes.

Choose Print Inventory Labels if you want to print a barcode for every item in inventory.

Choose Print Barcode Book if you want to print all the products in all departments or just products in a single department.

Choose Setup Barcode Format if you need to setup the type and size of barcodes as well as other barcode settings.