You can add work types which can later be used when defining default turn resource requirements. By defining default turn resource requirements, you identify the skills required for an aircraft turn based on the aircraft type and work type. Work types generally identify the type of work associated with a work package—for example, LINE, HEAVY, TURN.
Once added, if required, you can only edit the description. You can also delete a work type if it is not referenced by any default turn resource assignment in the system.