I'm wondering what happens to existing tickets if I change a request type. Will those tickets still be accessible? Will they automatically change to the new request type?
Do you mean you are just renaming a Request Type?
In my environment i have a Request Type Facilities which i renamed to FacilitiesNEWNAME. After i made that change and did a ticket search, all the tickets that previously showed Facilities now showed FacilitiesNEWNAME.
Was there something else you were changing about the Request Type?
