Hostgator Questions : Addons, subdomains, a portal site?

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For Hostgator FAQ or any questions about hostgator webhosting or hostgator sales read this query posted by jamestl2 on 05 December 2007

I had a few concerns (Sorry if these are dumb questions, I don’t have full access yet):

1. Moving the Primary Site
I currently have domain1.com as my primary domain, however I don’t want to keep it as my primary domain. I have domainB.com that I’d like to replace it with, and I suppose make domainA.com a subdomain? Where could I get this information, I searched, but came up with nothing.

2. Subdomains and Addons
I know sites are managed by the first one (ie: domain2.domain1.com, domain3.domain1.com). But say I wanted to have forums.domain1.com, would this also be viewed as an entirely different site (domain4.domain1.com)? Are there any differences or effects when visited by searchbots, rankings, etc.?

3. An administrative Portal Site
Would it be possible for me to manage everything from a “Dummy” domain? I’d really like to manage all my sites in one place together, and it’s more convenient if I were to just be able to select one to edit, add pages to, etc. in one section of my directory. And I wouldn’t need this “Portal” primary site to be indexed or visited by anyone (like google).

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