Word is driving me CA-RAZYY!!

I'm accustomed to using Headings 'n all.  However, I need to add
corresponding numbered paragraphs (or I guess it could be a list) to a
document, as follows:

Heading 1 Text
Heading 1.1 Text
   Paragraph 1.1.a  Text
   Paragraph 1.1.b  Text

Heading 2.1  Text
Heading 2.1.1  Text
    Paragraph 2.1.1.a  Text

and so on.  I'm having a devil of a time trying to get the headings to work
and create the numbered paragraphs so that I can go all the way to at least
the 4th-Level Heading (1.1.1.1, etc.).

Can ANY1 help me w/this b4 I go running into the night pulling my hair?

Thanks!!!