To add a new group to my address book, follow these steps:
Click on Address Book near the bottom left of your screen.
Select the New Group button on the Address Book toolbar.
Under Group Name at the top, type in the name of the new group.
Select people you want to add to the group from your Address Book list, and click on the Create Group button at the bottom.
Adding a group to your existing address book is a good way to get organized in Webmail.