[otrs] movement of Freetext-field

Hi, the otrs::itsm-documentation says that freetext-field 3-6 & 13-16 may not be in use if you install otrs::itsm, because they are used through otrs::itsm. So, if you have them in use, how do you move these fields to other fields. I just don't know. I could imagine to make DB-manipulations with updates on the table ticket (and to ensure data-consistence) on ticket_history, but GenericAgent would be the clearer way. Any ideas? Bye, Alex