Look at this example of nested list structure from the Peachpit Press Visual Quickstart Guide

Nested lists are ideal for outlines, but don't feel limited. You can nest any list inside any other list. Just make sure each list has its own beginning and ending markers.

The Great American Novel

  1. Introduction
    1. Boy's childhood
    2. Girl's childhood
  2. Development
    1. Boy meets Girl
    2. Boy and Girl fall in love
    3. Boy and Girl have fight
  3. Climax
    1. Boy gives Girl ultimatum
      1. Girl can't believe her ears
      2. Boy is indignant at Girl's indignance
    2. Girl tells Boy to get lost
  4. Denouement
  5. Epilogue
<OL TYPE=I>
<LI>Introduction
<OL TYPE=A>
<LI>Boy's childhood
<LI>Girl's childhood
</OL>
<LI>Development
<OL TYPE=A>
<LI>Boy meets Girl
<LI>Boy and Girl fall in love
<LI>Boy and Girl have fight
</OL>
<LI>Climax
<OL TYPE=A>
<LI>Boy gives Girl ultimatum
<OL TYPE=1>
<LI>Girl can't believe her ears
<LI>Boy is indignant at Girl's indignance
</OL>
<LI>Girl tells Boy to get lost
</OL>
<LI>Denouement
<LI>Epilogue
</OL>