User Management for Project Manager allows the delegation of User Creation to powered users depending on a dedicated Project Permission.
To delegate this feature, you have just grant powered users with one of Create User permissions.
Delegation of Create User Permissions
As JIRA Administrator, you are allowed to delegate the Create User operation to powered users, by using some custom Permission. Also, powered users will be allowed to create new users (Only Create ...).
Delegated Create User Operation
As soon as you are granted to create users through the custom Create User Permissions, you will have access to the Create User button in User Role management section ...
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Overview
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