Google hit customising

Hey there,
I was just wondering, if you know how to make your google hit, display specified pages under the domain name. I hope this image illustrates, better than I can articulate in words.

Is it a site-map document that does this?
How can I achieve this?
I don't mind learning how to write the document, in order to do this. I would also like to learn if a plugin can streamline this process.

Thank you for your time,
Yours sincerely,