In Magento 2 Split Order Marketplace Add-On, the customer will view the combined shipping rate in the shopping cart as per the below image.

After placing the order, the customer will get the success message along with separate order ids.

The admin can navigate to these order ids individually to view the order details and the shipping price as well applied to each order.

For the Order – #000000231

For the Order – #000000232

For the Order – #000000230

Note: All the shipping & handling will go to the admin if you are using Default Magento Shipping options or third party shipping options. And only the admin can set the shipping rates for Manually Driven Shipping Methods.

But if you want the seller to configure the shipping cost for Manually Driven Shipping Methods and shipping & handling go to the seller, then you have to use any of the Webkul Shipping modules.

If you have any issue, please feel free to add a ticket and let us know your views at https://webkul.uvdesk.com