SUMMARY
Google Groups and Collaborative Mailbox can be managed by Owners and Managers of the group. They can add/ remove / assign access level / roles etc to the users in that group.
DETAILS
To create a new Google Group or Collaborative Inbox, raise the Service Request.
Collaborative Inbox /Google Group Setup and Use for Owner & Managers Click Here
Request to add to Google Group :
1. Open Google Groups
2. Search the group name you want to be a part of and click on it.
3. Once the Group Page is opened - Click on the 'Ask to Join Group' button - the owner of the group will add or you can click on the 'Contacting the Group's Owner and Managers' URL link - to get in contact with the same for any concerns.
4. If there is no link " Ask to Join the group" and you do not know who the group owner/ manager is, open a fresh service ticket to get your name added to the group.
5. If you want to be the owner of the google group/collaborative inbox, create a service request