If you’re familiar with the desktop version of Word, you know you can insert a table of contents that will update automatically whenever you make changes to headings. Word Online preserves an automatic table of contents already in your document, but it doesn’t yet provide a way to add one.
Instead, if you have the Word desktop application, use the Open in Word command to open the document and insert the table of contents.
When you’re done and you save the document, it will continue to store the table of contents when you open it in Word Online.
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