Right now if you've imported a big catalog (say, Otto, or AS Colour, or Los Angeles Apparel) of items into the custom products section, and you want to update them in bulk, you have to DELETE literally all products and re-import (you can try just over-writing, but if the descriptions or color options have changed, old data will stay up there and it gets messy fast). We need to be able to selectively delete (ie, delete all items from SupplierX) so we can confidently upload replacements without messing with the other supplier data.