We've been on eBay long enough that we still have tons of First Class Shipping duds in our shipping option details when I edit the listings. I'd like to add USPS Ground Advantage to all my listings because I feel we are losing potential sales by not offer that as a discounted shipping option. I tried through bulk edit but couldn't find the option to add that service. Any recommendations, please?

How To Bulk add Ground Advantage shipping option to 4,000+ Listings | Ask a Mentor

How To Bulk add Ground Advantage shipping option to 4,000+ Listings | Ask a Mentor | eBay Community