A further few references of the oldie-but-goodie variety. You may well find the principles useful even though some things about Word have changed over the years.
SEVEN LAWS OF STYLES http://office-watch.com/office/archtemplate.asp?v4-n20 AUTOMATIC NUMBERING IN WORD http://office-watch.com/office/archtemplate.asp?v4-n21 THE SEVEN LAWS OF WORD'S OUTLINE NUMBERING www.matsu.nl/Files/sevenlaws.doc