I'm trying to book a fixed mileage award BCN-YUL-YVR. The first leg (BCN-YUL) offers Prem Economy Rouge (fine with me) or economy (not desired). The second leg (YUL-YVR) offers economy only if Prem Econ chosen for the BCN-YUL leg. However, if economy is chosen for the BCN-YUL leg, business class is available for the YUL-YVR leg. Is it possible to book Prem. Economy for the BCN-YUL leg and then business for the YUL-YVR leg by calling in? TIA.