on CMOS Shop Talk:
One of my favorite MS Word tricks allows a novelist (or any book writer) to view and organize their chapters in the Navigation pane (an option under the View tab). Using this feature, I can see all my chapter titles at a glance, and I can go instantly to the one I want by clicking on its title. Moving a chapter to a different location is as easy as clicking and dragging it down the pane. Numbered chapters renumber themselves like magic any time I change their order.
If you ever need to add, delete, or move a chapter while you’re drafting, you can make good use of this trick.