I don't know what to call it but if you search bestbuy there a bunch of link under there so does anyone know what kind of code to do that???and if u do please post it here or give me the link.
There is no code to do that. Google is choosing what they add (if they add) there. There is no way you can influence that with a piece of code.
Google adds this feature to web-sites automatically when your web-site is established and has a good volume of visitors, and incoming links. You will notice that you see this a lot if you search for specific web-sites. For example if you search on google for 'web design' then no-one has one. However if you look at one of the companies that come up top for 'web design' (I'm looking on google.com) say for example www.webdesign.org/ Then Google 'Web Design Library' you will see that webdesign.org has one of those mini link lists.