How to bulk edit (update) existing listings?
You can easily bulk edit / update your existing listings by going to the Listings page (Members Area > Selling > Listings):
At the top of the listings, click on the drop-down menu, then select the "Select All ## Matching Listings" option:
Scroll to the bottom of the page and click on the "Bulk Edit" button. Once the Bulk Edit window appears, you will see most of the same fields you would when creating a new listing, or editing an individual listing; such as Shipping Costs, Enabling Offers, etc.
Click "Edit" next to any field you wish to change. Review your changes, and then click the "Update" button.
All your listings will then be updated over the next few minutes with the changes you've indicated.