As you number headings, figures, tables, and other elements, it can be tedious to keep track of number order and nesting. You can automate the numbering of elements by clicking Insert > Number (Dynamic). This will create a number that will update each time you edit the page.
If you have a chapter that already has manual numbers in headings or figure titles, you can also have the system attempt to automatically find and convert them to dynamic numbers by clicking Chapter > Functions > Find element numbers.
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Access it online or download it at https://books.byui.edu/userguide/numbering.