HI. Have have booked two business class rewards seats from Melb, via Dubai to Paris using QFF points. I would like to change the Dubai/Paris leg to Dubai/Hamburg. There are award seats available on the Qantas site. Is it possible for me to change online the last leg, without cancelling the Melb/Dubai leg, or do l need to call Qantas and pay the points for assistance?. Thankyou for any advice.