Custom Heading 1 Autonumbering

Hello all,

I've searched and searched the forum to find a clue to my dilemma, but have had no luck.

This is a related to a previous post about formatting a Heading1 with a black background and white text in front. I have successfully figured that part out (as a table cell with Heading 1 inside of it). So here's part II:

I need the numbering in front of the Heading 1 to look like this:

14.1 Heading 1 Title Here      -----> the format of this IS Heading 1 where 14=chapter number, and 1=Heading 1 number

I'm trying to accomplish this with auto-numbering, but it appears that there is no way to get H1 paranum in there. Here are some I've tried:

<$chapnum>.<$paranum>

and

<$chapnum>.<$paranum[Heading1]>       ->but these do not appear to be allowed in autonumbering at all.

Also tried two separate Heading 1 paragraph styles:

<$chapnum>.<n=1>      ->paragraph named Heading1=1; that part works

then in Heading 1

<$chapnum>.<n+>         -> that doesn't work; obviously the two paragraphs are not connected

Can I create a variable that will do this, and insert it in a cell before the Heading 1 text?

Chapter&Heading1Num = <$chapnum><$paranum[Heading 1]>