@macropod - I signed up for this forum (and this is something I hardly ever do) because I wanted to reply specifically to your comment.

You should not be doing what you're suggesting - especially in a corporate environment - as the proper use of Styles is the foundation upon which good documents are designed and managed.

This p*ssed me off so much because I was scouring the internet for about a good 10 minutes looking for an answer to the exact question the OP posted, and I thought EUREKA when I saw someone had answered their very question.

When I actually read your response, I was filled with such disdain! "You should not be doing what you're suggesting," WHY THE HELL NOT? "as the proper use of Styles is the foundation upon which good documents are designed and managed," fair enough -- except I can't get over the fact I think you're just covering up for a HUGE gigantic flaw in MS Word. Wow that totally sucks about MS Word, "especially in a corporate environment," how do you know they work in a corporate environment?

What if someone is editing a doc that never came from a corporate environment for their own personal use, and for whatever reason, their doc is RIDDLED with these stupid Headers plaguing the navigation pane? THEN WHAT? DOES the OP ever get a solution to their query? NO! No thanks to you, too!

I am so fed up manually removing all 100 of these stupid headers from my doc, while trying to keep the unique formatting of every little instance. I have no idea how the hell the original author of my doc managed to make about 100 "Header 1" navs all completely unique formatting. I could scream at the stupid original author, and I could scream at you, which I just did.