Okay, let me paint a little picture here. I keep a Master User Guide for the software I help manage, and I organize it into sections with numbered headers. e.g. 1, 1.1, 1.1.1, etc.
The first Header 1 is mostly for my Master User Guide to separate the software modules. When I make the User Guides, I make them by Modules. So, I navigate to Headings (CTRL + F & Click Headings), find my module heading, right click and 'Select Heading and Content' to copy, then paste into a new document.
Now comes the problem I have. The Header 1 on the new Document can be deleted, and everything else needs to be promoted by 1. I can right click the main headers, in this case header 2s in the Navigation Headings and 'Promote'. If I click on the headers, they show up as the proper headers. Headers 2 change to header 1s, Header 3s under the header 2 change to header 2. However, the numbers don't change. I have to go up to the Styles area and see they're correct, and literally click on the header it's on, then it'll update numbers. I have a lot of sections, so it's time consuming to go through them all to update each one by clicking on the heading it's already on under the styles menu.