Roles as members of other roles
When a role is a member of another role, all permissions that are granted to the second role are extended to all members of the first role. For example, the Quality Tester role is made a member of the System Operator role. You can grant all System Operator permissions to all members of the Quality Tester role.
The Quality Tester role can also be granted permissions in addition to those granted to the System Operator role. This does not affect any other members of the System Operator role. The Quality Tester role inherits permissions from the Operator role. The Operator role does not inherit permissions from the Quality Tester role.
A user who belongs to the Quality Tester role inherits all that role's permissions. They can be modified at the user level without affecting other members of the Quality Tester role.