Multi level menu help

Hi i am new to web development and am still wrapping my head around it all, a bit overwhelming at times.
however i would like help in making a menu like that one that has.

The main hamburger menu on their homepage.

Its got the menu icon animation, the main dropdown menu options, along with the sub-menu for each of those.
It covers the full screen.

I can imagine it a long process to make it in webflow, but would appreciate any help.


Here is my site Read-Only: