The Index module control displays a tree-like structure making it easy for users to navigate to different topics. There is no limit to the number of topics or how deeply nested you need.
In edit more, the Index module allows you to move your content easily simply by dragging the icon and dropping to any location in the tree. This module control should be placed along side the main Wiki module control on the same page.
By default, your topics are organized alphabetically. You can re-organize the topics simply by dragging and dropping the topic to where you want it to be positioned.