ORS Rebooking

Will the ORS rebook cancelled flights? I ask because I activated a schedule at just the right moment so that the flights were scheduled, but I had not yet added a cabin to the aircraft. So now I have multiple flights scheduled without seats. Can I cancel these flights, and have them rescheduled with the seats installed?

Or do I need to delete the flight plan and start all over?

No, not at the same date. But the new flights available for booking will be offered with seats.

There is a kind of workaround - delete the schedule and create with new flight numbers but please cancle the flights before.