Printing Barcodes On A4 Sheets

To print barcodes on an A4 sheet, go to Admin / Settings / Products and set the Barcode label size.

The label packet should have the sizes to be used

This will change the settings in barcodes.lbx, so if printing to a barcode label printer, select Format 5 or 6

Then you can edit the label as desired.

Test using a quick print product label selecting Qty to Print =  the number of labels on the page

The print preview looks as below:

Also see Schedule Barcode Labels  to print several barcodes on one A4 Sheet.