Begin by creating a Department to group related ingredients, such as a Toppings Department or Sauces Department. Ensure the Shown individually? property is disabled so the Department itself does not appear as a menu item.
Once the Department has been created, create new products for each individual ingredient (e.g., for Toppings: Pepperoni, Bacon, Olives; for Sauces: Tomato, Barbecue, White sauce). Disable Sold individually property so these ingredients are not shown as standalone menu items.
Once the Customisation is created, assign it to the relevant product. This makes the options available during the order process, allowing staff to add or adjust ingredients as required.