Hello,
To create a group please go to manage -> domains -> {domain_name} -> sharing [tab]. Here you will see an option for "Groups".
User Groups are used when permissions need to be give to specific subsets of domain users in order to access shared resources. For example, if a business wanted to make it easy for members of its Sales Department to share their calendars with other team members, the domain administrator would create a User Group for all the Sales Department employees.
Hope this helps. ~Tony
Tony Scholz
System/Network Administrator
SmarterTools Inc.
www.smartertools.com