[otrs] How to create super customers ?

Hi, I'm new to OTRS and I'm trying to configure it. I only have 1 customer company with it's own queue right now and I want to do this: -For average customer, only view his/her tickets -For two or three super customers (admins in the customer's company), be able to see all tickets of the company. I've read some doc and enabled the CustomerGroupSupport option, but it doesn't change, even when i set a customer rw in the good queue. Thx to anyone who can help me. B.