Hi *1pinkshoe*,
It's great to hear you wish to support a nonprofit through eBay Giving Works!
You are able to edit your listing, and add the donation option. This option is located in the "Choose how you'd like to sell your item" portion of the Edit Your Listing page. You may have to choose to "show more listing options" in order for it to appear. Once there, you can choose from any of the over 20,000 nonprofits in our database, and also select the donation percentage you would like to donate. Please remember that there is a minimum donation requirement of $1 or 10% (whichever is greater). This is the minimum donation required per listing however. Therefore, with a bulk listing, you won't owe a $1 per item. It will be based off of the donation percentage you selected. I hope this helps and best of luck!
In community,
meghann@ebay
www.ebaygivingworks.com