Coding for an Index Page

Site URL: https://www.cainla.com/

Hey guys! 

Quick question if anyone has an answer. I have a site that has an index page as the main navigation. Reason being is because I have other titles and pages underneath that I want on one page. I am on 7.0 the Brine Mojave template so you can see what I mean about the multiple pages. I want to have those multiple pages under the index page on the main navigation as well so when you click on "Listen" or "Features" it drops you right on that area of the one page. I have spoken to squarespace already so I know within their site it isn't doable but I am hoping with some custom coding we might be able to make it work. Any help is greatly appreciated! I will attach some files as well so you can see.

You mean show a dropdown under About Us item >> Dropdown will have: About Us, Listen, Features..?

Hi tuanphan! No, I don't want a drop down. I mean on the main navigation I want About Us, Listen, Features. And I want all of those main navigation clicks to anchor to different spots on the same page. The problem is that because it's all on one page just in different sections, squarespace won't allow me to add those buttons as separate main navigation buttons outside of About.