It would have been helpful if you gave the full scope of the project at the outset. What you're now asking for would require a complete re-write.
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highlight any numbered headings
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Highlighting numbered headings can be done by changing their Style definitions (you are using Styles, aren't you?).
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autopopulate entries in the FindText array
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generate a list of number of instances each term appears
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To see what's involved for these two aspects, go to:
https://www.msofficeforums.com/word/...sage-same.html. Although the code there does somewhat more than you're asking for in this case, it is similarly complex, as the code has to both build the list and generate the output.