Well, you have 2 options.
1. Use communityserver as your root site itself....which will take over your entire site.
2. Create another sub-domain like....http://community.dynacx.com (mysite), and put your communityserver installation site there. That way you will have your parent site running separately  and your communityserver site running separately.


Not that I am trying to market for Community Server, but the 2.0+ version is supposed to act as a replacement for your site....basically enabling u to build a site itself.

Should there be any questions, lemme know.

Regards,
Sashidhar