I was looking at some of my old tutorials for dod, remember the old interface for a command menu in Half life 1 games?
The SourceMod "adminmenu_custom.txt" is a lot like this format, there was a simple tool that could help some people editing the adminmenu_custom.txt file, it's called "Commandmenu Editor (FREEWARE) " by Anselm Föhr.
Now some may like editing this raw and some get confused, all this does is display the menu with + and - and hide and unhide sections of it. For some it shows the layout of a complex menu eaiser to edit so you may like to give it a go.
Download is here.