Change menu structure (Jerome is God!)

[Duke John]

Knew it too for ages. I plan to use it to disable honour/weapon/armour upgrades for MP games. And you can also add images to the background so that each submenu has a different background, which means that you can make some very neat interfaces if the background "interacts" with the background behind it.

[Monkwarrior]

Could somebody give a short tutorial/walkthrough about this subject?
I'd like to change, at least, two aspects:
- Eliminate buttons for non-used factions in custom battles (MP also?).
- Include descriptions for provincial campaigns (is it possible?).

I've been regarding the file but it is a little...