Few things to keep in mind:
- If you disable a customer's account; all of their sub-user accounts created will be disabled as well
- Removing a user from the panel will also remove all their sub-user accounts
- Customers can only give permissions to sub-user accounts on servers they are listed as the owner (if a user has group related permissions to a server, and is not listed as the owner; they can't give sub-user accounts rights to that server)
- Sub-user accounts can't create sub-user accounts
- Demo users cannot create sub-user accounts