Adding a dropdown menu to the main menu

Is there a simple way to add a dropdown menu to the main menu and have it point to different parts of the same page (or even different pages)?
For example, if I hover over this:
I would ideally like to see:
Publications
- Journal Papers
- Conference Papers

Which would take you directly to that section of the markdown file instead of making you scroll down the file.

I have attempted this via html but my skills are very basic. Any help is appreciated!