zulip/help/include/user-subgroups-intro.md

You can add a group to another user group, making it easy to express your organization's structure in Zulip's permissions system. A user who belongs to a subgroup of a group is treated as a member of that group. For example:

• The “engineering” group could be made up of “engineering-managers” and “engineering-staff”.
• The “managers” group could be made up of “engineering-managers”, “design-managers”, etc.

Updating the members of a group automatically updates the members of all the groups that contain it. In the above example, adding a new team member to “engineering-managers” automatically adds them to “engineering” and “managers” as well. Removing a team member who transferred automatically removes them.