*laughs* A few posts ago, you were trying to get users to pay you to design a site, and now you need help on this simple question yourself.. Interesting.
Yes, use subdomains, and folders.. i.e. under the public_html directory of your file manager, make a new directory something like site2 or something, then you can go to http://yoursite.x10hosting.com/site2 and it can be completely different from what's in http://yoursite.x10hosting.com