#1 - Sept. 23, 2010, 1:46 p.m.
Well, you can merge between 2 Battle.net accounts, although if one is newer, there is a 30 day wait.
That is of course presuming they are both under your name.
Billing could also help with this. You can have up to 8 WoW accounts on a single Battle.net account.
Billing and Account Services
Phone Support - 1 (800) 59-BLIZZ (1 (800) 592 5499)
Live Representatives Available 7 days a week, 7am to 8pm Pacific Time
E-mail Support - Billing@Blizzard.com
Players in Australia should call 1-800-041-378
Players in Singapore should call 800-2549-9273
Players in Chile should call 1230-020-5554
Players in Mexico should call 001-888-578-7628
Players in Argentina should call 0800-333-0778
All other international players should call: (949) 955-0283
Further contact information can be found here...
http://forums.worldofwarcraft.com/thread.html?topicId=24702231246