If you want to provide support to company/usergroup this add-on will work for you. You can create number of companies with number of users.
To create company please go to Support Plus > Add-On > Company/Usergroup > Add new Company.
While creating company you can search wordpress registered users and add them as a company member. It is compulsory to set at least one user as a supervisor.
Supervisor of the company can see all tickets raised by member of same company. A company can have more than one supervisor.
Members of the company other than supervisor will not see each others ticket. They can only see tickets created by them.