How do you get expanded google results

[tinplane]

Greetings,

When you do a search for certain keywords, (example: cars, lionel trains) sometimes the first or second result will have the usual format.... but, under the listing it will have links for several subcatagories.
For the search "cars", Google returns cars.com, and under the listing is subcatagories (links) for thingsl like:
Sell you Car
Dealer Center
and, More results from Cars.com

What are these results called?
and;
HOW DOES ONE GET THEM?

Thanks in advance for your time.
Dan

[bobitza]

They are called site links

[NetProwler]

Site links are automated and if the site has importance in the eyes of Google, the links are generated automatically. There is little one can do except blocking some of the URLs through Webmaster Central.

[eprofitz]

Those sites are consider authority sites for their topic and having a directory structure doesn't hurt.