Hi!
There is a fairly easy way to change the templates in your Saved Listings by using our "Find & Replace" feature. Note that this will not update any current, live listings on eBay. It may take a little longer to update all 13,000 of your listings because our tool works best when you update 50-100 listings at a time. Still much quicker than updating them one-at-a-time though!
Go to your Saved Listings page and check the box next to the listings you want to update. (There's a drop-down menu choice to show 100 listings per page, and then you can just check them all at once with one click.) Next, hit the "Find & Replace" button at the top of your Saved Listings.
You will then be taken to a page where you will select the field you want to update--in your case you will choose "Listing Template." Where it says "Find Store Template," just leave it at the default "All."
Where it says "Replace With:" click on the blue Select Template box to choose the new template, then hit the Continue button. You will then be taken to a confirmation page to finalize your changes.
I hope that answers your question!
