If I change my flight, will the paid fees of the options for the original flight be retained?

Optional services that have already been added on the flight will not be carried over to the new flight.
If you change your flight, any paid options such as the selected seat, space seat option, and the checked baggage assigned on the original flight will be cancelled without refund.

The paid options on the changed flight such as seat selection, space seat option, or checked baggage require a new assignment with charges.