[otrs] customer webinterface queue selection

hi, we want use otrs to support our customers. the primary ticket handling should be done over the customer webinterface. we created a queue for each customer and added a new customer account. when the customer log in to the webinterface and create a new ticket, he can see all queues. what can i do, that the customer only see the queue, that is responsible for hes company? thanks for help regards pascal