How to Create Mail Merge Labels in Word 2003-2019 & Office 365 If you're making another type of document, use the "Insert Merge Fields" button in the "Mailings" tab. Be sure to add spaces, commas, etc if you're creating your own layout. Hit the "Update all labels" button and then "Next: Preview your labels." Check that your data copied over correctly and you're happy with the final result.