Menu in a Menu
I want to create a Guide App for a Game, for that I use Costum Pages (When theres a better way, please tell me..) Now I want a Main Catigory for example Buildings, and when you click on the Icon the Costum Page will open, and there you have a second Menu with all the Buildings.. When you Click on of these a new Page Opens with all informations.
Is this possible? And when yes, how?