Option items serve as additional items to a standard item. If they have been assigned to a standard item, they are automatically displayed in the selection of a standard item. If configured, they can influence both the price and the stock.
For example, a customer orders a pizza with cheese crust, where the cheese crust is an optional item with an additional price. The pizza costs 8€ and the cheese crust costs 1,50€. Thus, the price of the pizza with cheese crust increases to 9.50€.
Note: The difference between selection groups and options is that selection groups never change the price, nor the stock.