In StoreFeeder you can quickly upload new templates into StoreFeeder and apply the template to all your listings in bulk.
The first step is importing the template into your integration, to do this go to Settings in the top right then find the eBay integration you want to add the template to and press "Edit/View Integration". Once you're in the integration on the left you need to go into the "eBay Listing Template" tab.
On this page there is a "+ New Listing Template" button, once you press this you'll get a new window where you can name the template and select a file to upload.
Once you've added the template you'll be able to use it on the listing page or through the bulk import.
1. Assigning it to a listing individually using the listing page
If you go into a listing you want to add the template to then go to the descriptions tab. Below the textbox for your description there is a dropdown box for all your templates, you can select the new template from here and then save and upload the listing to push it to eBay.
2. In bulk using the Listings Import-Export
If you go to Listings -> Listings Import Export and from here select your eBay channel that you are changing the template for and in the fields to export add the eBay Listings Template field.
Now in the export that comes out, you can set the listing template field against all your listings or just some of your listings to be the name of your new template and then import the file back in to upload that to ebay.