Possible Duplicate:What are the most important things I need to do to encourage Google Sitelinks? For Example, if I Google Stack Overflow the site comes up but also links to the main sections of the site right beneath it (Login, Questions, Careers...)How can I achieve this with my own site?Thanks!
How do we get our sites' sections displayed under the description in a Google search?
seo;google;google analytics;search engines;google search
At the moment Google automatically includes this.As Google Webmaster Tools explains Sitelinks are automatically generated links that may appear under your  site's search results.This means you can't add them via some tool or code. The best you can do is to structure your correctly. See Google's page about this https://www.google.com/support/webmasters/bin/answer.py?answer=47334&hl=en