To create a group, perform the following steps:
Click New Group icon on the left pane in the Address Book toolbar in two-pane layout. Select New Group from the Actions drop-down list in the Address Book toolbar in three-pane layout
Or:
Click New Group from the toolbar on the right pane.
The New Group tab displays with the following fields:
Group Name: Enter the name of the new group.
Search Contacts: Search for a particular contact from all contacts in the default address book.
List of all the contacts in the default address book.
Enter the name of the new group in the Group Name text field.
Select the contacts by selecting the check boxes provided for each contact.
You can also search contacts by typing the name of your contact in the text area provided at the top of this column. Alternatively, to add all the contacts in the new group, click All check box provided at the top of the column.
Click Create Group.
The selected contacts are added to this group.