Unfortunately there’s no way for sellers to set their custom shipping cost per listing at the moment, this is possible in 2 cases:
- If they increase the listing price covering the average shipping cost
- If you enable some shipping method in WooCommerce that calculates the shipping cost automatically, based on some shipping method API
Sorry for the inconvenience - the Marketplace itself is not fully suitable for physical items, we have a disclaimer about this Marketplace - Allow users to sell listings | HivePress Extensions