Ordinarily, one would use Headings and a Table of Contents at the font of a document and an Index at the rear. By default, a Table of Contents hyperlinks to the corresponding Heading. If you add the hyperlinks Forward/Back buttons to the QAT, you can use them to quickly move back & forth between the TOC and the headings. If you want to cross-reference a Heading, you can do that via Insert|Cross Reference. Indexes in Word don't support hyperlinking.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]