On the account you want to no longer use.... on that domain name on the Domain Settings tab there is a MOVE link that will allow you to move the domain name into the required account.
I can no longer login to my second account because it will not send an email to reset the password. The account password reset does work on the primary account and they are the same email. How can I consolidate in this situation when I can not login or reset the password on the secondary account?