You can add existing users to the group when you add the group. Or, you can just add the group and then add the user to the group when you add the user.
Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
Start the Solaris Management Console.
# /usr/sadm/bin/smc &
For more information on starting the Solaris Management Console, see How to Start the Console as Superuser or as a Role or How to Start the Solaris Management Console in a Name Service Environment.
Click the This Computer icon under the Management Tools icon in the Navigation pane.
A list of categories is displayed.
(Optional) Select the appropriate toolbox for your name service environment.
Click the System Configuration icon.
Click the User icon and provide the superuser password or the role password.
Click the Groups icon. Select Add Group from the Action menu.
Use the Context help to add a group to the system.
Identify the group name at the Group Name prompt under Group Identification.
For example, mechanoids.
Identify the group number at the Group ID number prompt.
For example, GID 101.