This feature is available in all editions.
Follow these steps to learn how to add a new Member Group.
To set up a Member Group, your Admin Privileges role must be set to "Member Admin" or higher.
Click Admin > Members > Member Groups.
In the Member Groups page, click Add Member Group.
In the Member Group dialog box, enter a Title and Description (optional).
Now, you can start adding members to the group. See Assigning Members to a Member Group for instructions.