You can set the following properties for a workgroup.
Name: The name can be any alphanumeric string up to 50 characters in length.
User has permission to self enroll: When this option is enabled, users in the workgroup can enroll in or withdraw from knowledge paths available for self-enrollment. When it is disabled, users cannot self enroll in any knowledge paths; the manager must enroll all users in the available knowledge paths. In addition, users do not see the Enroll or Withdraw from Knowledge Paths link in the Knowledge Center when this option is disabled. If you disable this option at the workgroup level and knowledge paths exist with the Self enroll option enabled, the Self enroll option will be disabled for those paths.
Username Generation: When the Generate Usernames Automatically Using This Pattern option is enabled, usernames are generated using the information entered in the First Name and/or Last Name fields for a new user. Enabling this option makes entering a new user faster, since you don't have to enter a user name. It also helps to ensure that usernames are generated uniformly.