You can create independent or nested teams to manage repository permissions and mentions for groups of people.
Tip: Every organization member can create teams at the highest level of your organization's hierarchy. Only organization owners and maintainers of a parent team can create a new child team under a parent.
In the top right corner of GitHub, click your profile photo, then click Your profile.
On the left side of your profile page, under "Organizations", click the icon for your organization.
Under your organization name, click Teams.
On the right side of the Teams tab, click New team.
Under "Create new team", type the name for your new team.
Optionally, in the "Description" field, type a description of the team.
Optionally, if you're creating a child team, use the drop-down menu to choose a parent team for your new team.
Decide whether the team will be visible or secret.
Click Create team.
Optionally, give the team access to organization repositories.