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It is important that you have your required files in place and properly arranged in the PDF beforehand, so that you can create your section-starting pages, and their corresponding Table of Contents in the proper order in Word.  Having to move or edit these in Acrobat, after you've added the file there, is more complicated and inefficient.  

Page Numbers in the Table of Contents

If you suspect your reader might print out your PDF, you can add page numbers to the Table of Contents.

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