Add a category
Go to Settings > Shop Settings > Inventory management. By default, you should see Offers, Snacks, Prizes and Tournament Tickets. You should be able to add another category by clicking the "+ Add category" button on the right side of the screen.
Edit a Category
Right click on a category and click "Edit". You can change the category name, select an icon/logo and/or apply an overall tax percentage. Click "Save" to apply the changes.
Delete / Remove a Category
Right click on the category and select "Remove".
NOTE: Removing these categories could cause user interface problems: Snacks, Offers, Prizes and Tournament Tickets