fill in zeros as necessary to match the number of digits used by the last chapter number so that the bookmarks’ alphabetical sort order will also be numerically correct for the next step. For convenience, just name them after the chapter numbers, e.g., ch01, ch02, etc. Insert a bookmark at the beginning of each chapter using the Insert Bookmark command.
from a public domain work, or if you want to create one of your own, here’s how to link it so that you can jump from the TOC entry within the text to the chapter in the book: If there is a Table of Contents at the beginning of your document e.g.
