In ISPmanager Business, you can create a new user type called reseller.
The reseller can resell resources and services of its hosting, create and manage its own users. However, it cannot have its own resellers.
The reseller can create different access levels for each user, as well as add new templates for roles and create users from these templates.
Furthermore, these users will not have any rights to configure the server for they will use this server like standard clients.
Resellers are able to set up quotas on the disk, amount of FTP accounts, mailboxes, databases, and some other parameters.
Administrators can determine specific limits for their resellers, just like for simple users.