Go to Items & Orders > Products (in dev).
Click Add product > Custom add.
Enter the product's details: Display name > Print name > Name > Description.
To upload an image of the product by either choosing a local file or dragging and dropping a file.
Select the Category > Printer location(s) from the dropdown boxes.
Click Product with variants.
Enter the Variant Attribute (e.g. Size) and Variant values (e.g. Sml, Med, Lg).
Enter the variant pricing.
Select the Tax Group and Modifier groups from the dropdown boxes.
Click Add another variant to add multiple variants to the product.
Click Save.
Note: If "hide from cart and kitchen" is checked, the item will not show in receipts and in the cart (However any sub items will show). This is best used for modifier groups to hide the name of the modifier group.