Originally Posted by
kayzng
Can I still request it to assign to either RJ or BA? if yes, what are the potential charges that I need to pay?
"Assign" isn't a concept in airline ticketing. You’d be asking to change the ticket which before departure of the first segment requires a full reprice.
That said only changing the routing from CAI-LHR should only involve a change in taxes and YQ. A few hundred dollars at most. But good look dealing with Qantas ticketing on this.
(edited because quote was missing a bracket)