Question : Word Outline Numbering Style Failing to Use Parent Style

I want the numbering for Heading 4 in a legal document to incorporate the Heading 3 numbering.  In Attachment 1, the headers "1.1.1" , "1.1.2", and "1.1.3" should be "2.1.1" , "2.1.2", and "2.1.3", respectively.  I've tried to customize the Heading 4 style to reflect this without success.  The Heading 4 outline number style is shown in Attachment 2.  What do I need to change?

Answer : Word Outline Numbering Style Failing to Use Parent Style

You are in a minefield. I'll throw you a map, but I don't feel like coming in after you, at least not until I have read it all again... and again...

http://word.mvps.org/faqs/numbering/WordsNumberingExplained.htm#Toc