Dear dhorgems,
Thankyou for your query.
If the buyer has added items from various listings which have separate shipping charges, during the checkout the buyer would be charged the shipping cost for all.
However you can set up your combined shipping preferences so that you can save time and money by sending all their items in one package. Visit the following link for more details:
https://www.ebay.com/help/selling/shipping-items/shipping-rates/offering-combined-shipping?id=4169
You can set up your preferences from the Manage Shipping Settings page :
https://www.ebay.com/ship/prf
Incase of any further assistance please connect with your respective account manager or contact the eBay customer support team.
Regards,
eBay IN CBT Team
