Title numbered automatically increase

Hi,

Is it possible in InDesign CS5.5 to have the title number to increase automatically?

Let me explain more. I have 3 levels of Title.

Here an example of each level

First ;evel: 1. Context

Second level: 1.1 Responsibilities

Third level: 1.1.1 Actions

My document is big. As example, second level can go up to 1.35

I don't want to write the number manually for each level - too many chances to make a mistake.

I would like to know if there is a way to make it automatically, that InDesign would know which number the title is at?

thanks