Hello All. First time in BA forum. This seems to be the place to ask this but apologies if it it not. I have just joined BA Executive Club having moved from Australia. I am still Qantqs silver. HAve booked a flight in BA business and entered my new BA number in the booking. I would like to choose my seat 7 days out which I believe can with silver status in OW. Can I remove my BA executive number, enter QF number , choose seat and re-enter the BA number? If so how doI do it? Thanks for help.