My current itinerary is:

YOW-YYZ (stop)-YVR-AKL (stop)-PER (POT)-SIN-PEK-JFK/EWR-YYZ-YOW.

Does Aeroplan allow to change the stopovers after the completion of the first flight? Specifically, when I am in YYZ, does AE allow me to then change the ticket to ... ?:

YYZ-LHR-SIN-CHC (POT) - SIN-LHR-ZRH (stop)-YUL-YYZ-YOW

Thanks!