I would like to add an additional barcode to my products so there are multiple barcodes listed on the Barcode tab. Is there a way to upload the additional barcodes in bulk so I don't have to add them to products one by one? Will the original barcodes be overwritten if I upload in bulk?
If you bulk upload the new barcodes through Load Utilities, the current barcode will be overwritten.
If you bulk upload the new barcodes through Admin Operations, using the headers "sku" and "barcode", the new barcodes will be added as an additional barcode.
For more information on bulk uploading through admin operations, see the article How to create products in bulk using admin operations.