World20

ORY-LHR-ORD-PHX-LAS

I am looking at the following award ticked for 2 people. BA LHR-ORD first class. 1) Can I add US flights (domestic first class) onward (LHR-PHX-LAS) in US on same award with no additional miles? Both the BA and US flights show as available on AA.com. 2) On the front end can I add a local BA award (ORY-LHR) again for no additional miles? This sequent does not show on AA.COM, but paid tickets are wide open on the BA site.

Thanks for any help. This is a convoluted itinerary because no wards flights in business or first show as available.