[otrs] Transfom a ticket into a follu-up: is it possible?

Hi there, I'd like to know if it's possible to transfer a newly created ticket into a follwup for an existing ticket. I've tried with the Merge feature: now the tickets are merged, but each still preserving their own ticket number. I try to explain better: I have merged 4 tickets, and that's ok, but in the queue, I still find the 4 tickets, only if I click on one of them, I notice that they are merged in a single request. What I'd like to obtain, instead, is to have only one ticket shown in the ticket queue. How is it possible to achieve that? Thanks a lot Gabriele D'Andrea