I am working on creating a site for our partners who can be registered members of our customer portal or they can be new users who can self sign up. I want the experience to be like a internet site with multiple links/tabs for multiple areas of website. I am not able to figure out how to create multiple tabs on my site.

Do I need to create a new Force.com application for this or can this be achieved with out it?

If there is any step by step guide for this topic I would really appreciate pointers to it.

Thanks in advance.