How to Create a Modifier Group:
https://workdrive.zohopublic.com/embed/km3ix059b99599ada477d91b1db37d0722082?toolbar=false
Select “Products/Items”, “Modifier Group”, then “+Modifier Group”
After typing in the name of the group, you must attach the modifiers in the “Modifier” tab, select “Update” when complete
Note: Modifiers must be created first before attaching them to the group