iCloud: Create a group and add contacts to it
Contacts includes a default All Contacts group.
Create a group
In iCloud Contacts, click the Add button in the sidebar, then choose New Group.
A new group is added, with a placeholder name.
Type a name for the group, then press Return or click anywhere outside the text field.
The group immediately appears in alphabetical order.
To change the group name later, double-click it and type a new name in the text field.
Add contacts to a group
Click All Contacts.
Drag one or more contacts from the All Contacts list to another group on the left.
You can add a contact to more than one group.
To select several adjacent contacts, click the first one, then Shift-click the last one. To select multiple nonadjacent contacts, Command-click them on a Mac or Control-click them on a Windows computer.