How do you make sub accounts on wow

All WoW accounts would then be slaves to the main battle.net account. To make more sub accounts, simply install a trial version of WoW and when asked to register it, file it under your existing battle.net account.

When you log in and then see it listed there, that's the time to start its subscription and/or pay for the full version. This way you don't lose any money if something goes wrong.