Custom menu items in admin

Question

I would like to add my own custom menu items to Appearance > Menus. How can this be done?

The best way to describe what I want to do:

Answer 1

Use the add_meta_box() function (working example), and use nav-menus for the post-type.

John Morris also wrote about this in 2013: How to Add a Fully Functional Custom Meta Box to WordPress Navigation Menus.