How would I be able to make sure Google lists search results as a combined listing opposed to a single listing?

I am slightly confused about how to let Google know to index our site as a complex listing opposed to individual page listing. Our site is well established and has over 3500 indexes. Does this have to do with the Sitemap or is it something else? Is there a way to expedite Google adding us as a multiple catagory listing opposed to a single listing?

Thank you for your help!