That's not what Bulk Edit is designed for; it is for making the same edit to a group of items. I doubt many sellers have multiple items that bear the same barcode (those that do would usually be required to be in a single listing).
I would have thought you would have been more quickly and better served by exporting your items; using the Ninja Lister, a spreadsheet application, or a text editor, to make the changes - and then uploading back to eBid with the 'overwrite' option set.