I have two reseller accounts. On one reseller account I have a domain, let's say gogomysite.com and alot of other accounts which use that domain. For example site.gogomysite.com, erik.gogomysite.com, world.gogomysite.com etc.
Now, What I want to do is move the website gogomysite.com to a different server. However, I want to keep all the other hosting accounts which use the subdomain on the old server.
Is this cPanel to cPanel? if so check if your new host will help you move the accounts, most will and they can easily transfer them over with WHM's transfer script, then you'd only need to update the nameservers for your main domain, give it time to resolve and you should be up and running.