Was wondering if there was a clean way to make a theme options page with multiple submenus?

I'm guessing it would be based off of this code: https://github.com/WebDevStudios/CMB2-Snippet-Library/tree/master/options-and-settings-pages

I'm currently trying to hack my way through that code...