CSRCartModifierFormHandler was extended to add a shippingGroupNickname property, so that when specified, it sets this form handler’s shipping group to the associated value from the shipping group container map. This allows you to associate a commerce item with a shipping group when adding it to the order. For example, by setting shippingGroupNickname="Home", the item is added to the “Home” shipping group contained in the SG map container.

Note that the SG map container must have been initialized with the ShippingGroupDroplet.