When you’re adding mail merge fields to labels, you can include barcodes if Japanese is one of your editing languages.
Click Mailings > Insert Barcode > Select a Field and a Barcode Type.
In the Field list, click the field you want to use to generate the barcode.
Word displays the barcode types that you can generate for that data in your list.
In the Barcode type list, click the barcode you want, click OK.
Click Update Labels.