How to give an player the permission to add or remove new users to his own group?

I need the permission like permissionex.parent.add.group.<group>.

Thx for help!
Greetz,
yololetsplay

Unfortunately PermissionsEx is currently unmaintained and no further updates are planned. Because of this, all pull requests are being closed. If you are looking for an actively maintained permissions plugin, take a look at LuckPerms. It is compatible with major server platforms and can import data from PEX.