These are both long threads, but many clues as to where/how to do it; the more recent posts are likely to be more helpful. At its simplest, Oneworld has an online booking tool that works maybe 50% of the time (very, very buggy.) Everything goes a LOT more smoothly if you know as much about the products as possible beforehand.

[NEWBIE LOUNGE] Ask Your Questions Here (flame free)

https://www.flyertalk.com/forum/onew...periences.html