I am trying to create a new command, so I could use a new hierarchy level in a book document class.
The table of Contents should look like this:
1. Chapter 1
2. Chapter 22.1 Section 1
1. Chapter 1### and so on.
I guess I have to use
\newcommand, but I don't know how to modify the hierarchy number to include "Theme" between "Part" and "Chapter". If you know a document class with a more complete hierachy than books and implementing a similar hierarchy, it will solve my problem as well.