[otrs] Service <--> Type Association previously asked but never answered.

Hi all, I have question I want to associate service with types if possible. If I'll choose type1 - there are Service1, Service2, Service3 in drop down menu for example. If I'll choose type2 - Service4, Service5 and Service6 comes... Is this possible , i searched the archive mails this question asked before but never answered. Thanks & Regards, Sarper Sarıdal