Item groups allow merchants to create and manage large groups of related items. This is described to merchants as an 'Item with variants'.
For example, a merchant may sell a T-shirt that is available in various sizes and colors. Each of the T-shirt variations is an item and belongs to the T-shirt item group. Once an item group is created, it appears in Register as a single button, and tapping it brings up a choice of which variation is to be sold.
Before adding items to an item group, you first need to create the item group. Next, you create attributes (such as 'size' and 'color') and options for each attribute (such as 'small' and 'blue'). Then, you create the individual items and include the item group id to associate the items with the group. Finally, associate the options with an item.
An item can only belong to an item group if the item group id is specified when the item is created.
The name of an item which is a member of an item group is automatically generated by the Clover server as a combination of the item group name and the name of all the options associated with that item. It cannot be changed. If the item group name is changed, or if an option name is changed, then the item names will be automatically regenerated.
An item can only be a member of a single item group and once it is part of an item group it can never be removed or moved to another item group; it can only be deleted.