Hey. I’m looking at doing a complex booking to try and get gold guest list before it’s unobtainable for me.

I want to to dub lhr jfk lax las or similar all on Oneworld.

when I do multi city it stops allowing to add segments once I get back to jfk. Is there a way to do the outbound flights and then get it to price up the equivalent return starting on a certain date? Help appreciated please.