Originally Posted by
Aztec_Flyer
I think that by booking it as two one ways you can solve your problem.
E.g. If you want to stop in LAX on the way out then book LHR-LAX and then LAX-YVR-LHR with YVR as your "stopover".
Thanks for the idea ^ I am planning to do something similar next year, flying NZ to LAX, and also making a stopover in either YVR or SEA.