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On the References tab, select
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Select one of the following:
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Update page numbers only This only updates the pages that the headings are on, and ignores any changes to the heading text.
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Update entire table This will reflect any updates to the heading text, as well as any page changes.
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Select OK.
Note: Manually created tables (not created automatically from the headings), can't be updated by Word. You'll need to manually type your changes in the table of contents.
