That is what i have used, and various other pages. This might be a stupid question to some, but I have no idea how to get it to work correctly.

It seems to work fine to begin with, but as I add more headings the numbering goes all over the place.

The main headings work fine, its the headings underneath.

I want the following style, but can't get it to work.

1.
1.1
1.1.1