I guess I've lost myself and you. Let's take this a setp at a time so I don't get discombobulated.
  1. Currently we have a domain and website. This domain still has a year to go before it has to be renewed, currently no plans to renew.
  2. We will be registering a new domain soon.
  3. Your saying, if I understand correctly, because we have the current domain as our root domian, when we register the new domain it will be an addon domain.
Am I understanding so far?