I have a question regarding the Refer a friend service.

I currently 4-box with all accounts under 1 battle.net account, if I add another account through refer a friend and upgrade it up to wrath and pay for 2 months to get the mount, will I be able to merge that 1 account to my battle.net account and still keep the mount? I forgot how I did this last time...

hope that was not too confusing lol