LaTeX: Group chapters into book sections

Question

I'm writing a book using LaTeX. I have a bunch of chapters that are going to be sectioned into three main parts of the book. How can I markup this kinda thing with LaTeX? Specifically: I'd like to make a table of contents which looks kinda like

PART I
Chapter 1
    - Some heading
    - Some heading 2
Chapter 2
    - ...
Chapter 3

Part II
Chapter 4
Chapter 5
Chapter 6

Part III
Chapter 7
Chapter 8
Chapter 9

Chapter numbering is ok, but I don't know of any construct that allows me to group chapters like this. I tried to fiddle with counters: forcefully setting counters on each chapters, then I added capters for each part introduction, set the chapter counter to romans and had a go. Unfortunately that didn't work, but I'm not entirely convinced it didn't work because it ain't possible, or if I just did it wrong.

Any help would be greatly appreciated!

Answer 1

There is the \part command which separates chapters into parts. This is only available in book and report documents which I assume you're using.