Phone them up and ask them to do this for you I know a few people that have done this because of the registerfly move over. They merged their GoDaddy account with registerfly domains in to their primary account. Make sure you have your account numbers handy when you phone them
I would agree with peter on this one, you should phone them up as it may be a pain in the butt pushing domains from 4 seperate accounts into one account, i find godaddy pushes a pain anyway, still i guess a bit of pain is worth it for the added security.