Adding Modifier for a simple item, after adding a simple item, for example, select Spicy Chicken Burger and edit it, go to modifier group and click on create new.
Click on ‘+’ and you can able to add a menu modifier
Next Select it
Can be added more menu modifier
Next, go to Spicy Chicken Burger Click edit item–>Select Modifier groups–>Click on Create new
Select Spicy Chicken Burger and press “OK”