See Merge Labels Using a Down-Then-Across Output in the Mailmerge Tips & Tricks thread: https://www.msofficeforums.com/mail-...ps-tricks.html.

The numbering automation can be done via either a SEQ field or applying automatic paragraph numbering.

If you're not using mailmerge, simply add however many rows you need by pressing the TAB key repeatedly within the table you've created.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]