I'm wondering how to link the footnote numbers in the body of my personal book to the actual footnotes.
Use the normal footnote function in MSWord or whatever editor you are creating the .docx in.
You simply utilize the footnote functionality within MS Word in your PB source The PB compiler will recognize the footnotes and build them into the PB book and they will work just fine.
The functionality in Word is found under Reference / Insert Footnote (or the keyboard shortcut Alt-Ctrl-F), see the sample document I used for the quick screenshot above:8688.Lorem ipsum dolor sit amet.docx