See: How to create numbered headings or outline numbering in your Word
document
http://www.shaunakelly.com/word/numbering/OutlineNumbering.html. That should
get you through this. If not, it is based on ...

Word's Numbering Explained
http://www.mvps.org/word/FAQs/Numbering/WordsNumberingExplained.htm

Additional information you may find useful or need is at:

How to Create a Template, Part II
http://www.mvps.org/word/FAQs/Customization/CreateATemplatePart2.htm

Legal Numbering
http://www.addbalance.com/usersguide/numbering.htm

Seven Laws of Outline Numbering
http://www.microsystems.com/fra_sevenlawsofoutlinenumbering.htm

The following are some discussions on the Microsoft newsgroups on numbering:
Nightmare on ListNumbering Street <URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&th=9e790fa7ed2886b3,18&ic=1>
The Joy of Lists <URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&th=811287ebce8fc203,15&ic=1>
Relinking ListTemplates <URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&th=2350746054c838e,12&ic=1>
Outline numbering: restart doesn't restart <URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&ic=1&th=2168093ed1c9eaed,6&se
ekm=muq2hs47vabsq381ngrm7fdmqj4s2e4ab2@4ax.com#p>
Format Doesn't "Hold" <URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&ic=1&th=3a351382011420bf,5&se
ekm=RXz39CAcCC$4Iwap@syntagma.demon.co.uk#p>
(above list compiled by Dave Rado, Word MVP)

ListNumbering Street Revisited <URL:
http://groups.google.com/groups?hl=en&safe=off&th=57df77857e4993ce>

See the latest numbering discussion I've seen, especially post #4 which
contains Dave Rado's concise instructions for setting up heading numbering.
<URL:
http://groups.google.com/groups?hl=en&lr=&safe=off&ic=1&th=bce07d7714769f5c>