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Third party listing tools are often considered bulk selling tools because you can produce or edit multiple listings at once.
eBay's free File Exchange is a spreadsheet interface that allows creating and editing listings in bulk through a spreadsheet.
eBay's Seller Hub and Selling Manager both have acess to eBay's Bulk Edit And Relist (BEAR) tool. That tool will allow you to create or edit multiple listings in bulk. The BEAR tool has a spreadsheet type of layout that allows you to revise a single field in all listings at once.
