LyX ⇒ How to configure word used for part, 4 levels of subdivision

[Paul Richards]

Hi, I am writing a thesis with LyX and I want 4 levels of section numbering, i.e "a.b.c.d", where a is the chapter number. I am using the article document class. I have tried making the chapter heading a Part. The problem is, it numbers it in roman numerals and puts the word "Part" before it.

It shows:
Part I
Introduction

Whereas I want something like:
Chapter 1:
Introduction

or maybe just
1. Introduction

NB: I tried another alternative, of making the chapters a section, which was not so bad. However, then I had to make my lowest level a paragraph, and whilst you can turn on the numbering for these, it does not leave a line space between the heading and the text, and I want this line space.

[d60pmp]

Consider using the report class, it's got chapters.