This topic is covered to various degrees in other threads, but I haven't found an exact answer to this question. I am trying to search for availability from ORD or YYZ to HKG on a OW carrier. Per suggestions from other threads, I have tried using the QF tool, but I don't think it covers CX, which is what I'm hoping to fly. I have also tried searching on the BA site, but every time I search, it tries to route me through London on BA flights. This is even true when it gave me the option on the left part of the screen to search partner airlines. I feel like I'm missing something really obvious here, but I've read the screen like fifty times, and I don't see what I'm doing wrong. Any help would be appreciated.

Thanks