Nested Navigation

[Snickdx]

Hi this is more like a feature request (if it not already supported). Is there anyway I can do sub navigation? That is provide a sub nav menu to navigate to a section within a page. This pattern allows users to quickly browse all sections of the website and navigate directly to one. Sections may be denoted by h2 or "##" in markup.

Would look something like this

Alternatively what can also work is if I can group together pages in a subdirectory which generates a dropdown in the navbar to navigate to the pages in it. Would save space from showing all pages in the top level navbar.