Your sample doc uses lower level headings as well so you need to configure the complete list in one go.
If neither H1 nor H2 are showing a paragraph number but H3 needs to reset after H2 then you can associate H2 with Level 1 of the list and give it no number. Then for Level 2, include H2.01 as your list element and tell it to restart after a higher level. H4 can then associate with Level 3, restart and be just the capital letter.

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Andrew Lockton
Chrysalis Design, Melbourne Australia