But I used a different email when I created a new account for CC, I have also paid for an annual subscription on the new account. I have just realised that, I obviously want my existing Behance linked with my paid CC subscription, how can I do this?
#1 Adobe Customer care does not know anything about Behance/Portfolio. Do not waste your time contacting them about this as they can't help you.
#2 I do not recommend combining work with personal accounts. I think it's very important to keep them separate because Adobe has contracts with whomever pays the bill. If your work is attached to a business account, you don't own it. The business does. And when/if you sever your relationship, you will lose any work that's attached to that business account.
#3 Behance has a separate help desk that you can submit a help request to below. They have a very small team & don't work on weekends. Be patient waiting for a reply.