Add-on: Item Modifiers.
A modifier is a choice a buyer can add to an item, such as cheese on a sandwich. A modifier can have its own price.
Open Inventory > Item Modifiers. Modifiers lists the modifiers. Groups lists modifier groups.

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Set up modifiers and modifier groups for your items.
Add-on: Item Modifiers.
A modifier is a choice a buyer can add to an item, such as cheese on a sandwich. A modifier can have its own price.
Open Inventory > Item Modifiers. Modifiers lists the modifiers. Groups lists modifier groups.
In Item Modifiers, choose Add New Modifier. Enter a name, such as Cheese. Add a picture if needed. Choose Save Modifier.
Set the modifier price when you add it to a group.
Find the modifier in Modifiers and choose Edit. Change its name or picture and save. Check any groups that use it.
Set Minimum Required to 0 when the buyer does not need to choose a modifier.
Find the group and choose Edit. Check its modifiers, prices, minimum, and limit. Save the group. Check an item that uses it before you sell.
Choose Clone on the group. Give the copy its own name. Change its modifiers and prices, then save. Attach the new group to the right items.
Use Set Item in Item Modifiers to choose the items that use the modifier or modifier group. Check the selected items and save.
Try the item on Sell. For an online item, check its page in the shop too. Make sure the required modifiers and their prices are right.
Add the item to the cart. Pick the modifiers the buyer wants. Meet any required choice rules.
Check the modifiers and their prices in the cart before taking payment. In the online shop, the buyer selects modifiers on the product page.
Find the modifier and choose Delete. Read the message before you confirm. Check the items and groups that used it so buyers still have the choices they need.
Choose Delete on the group. Read the message before you confirm. Check the items that used it. Deleting a group is not the same as removing a modifier from one sale.