I basically need a multi-level list attached to my heading styles and it needs to start at 4.2 at the beginning of the document on heading 1. Like this:

L4.2 Heading 1

L4.2.1 Heading 2

L4.2.2 Heading 2

L4.2.2.1 Heading 3
L4.2.2.2 Heading 3

L4.2.3 Heading 2

L4.2.3.1 Heading 3
L4.2.3.2 Heading 3

L4.3 Heading 1
etc...

Then eventually move on to:
L5.1 ? Not sure how to set this up.