Maintaining Inventory for everything you sell can be cumbersome. Drop ship processing translates into no inventory carrying costs, access to hundreds of thousands of products the ability to fill any order and ship to anywhere, and most importantly to provide the highest level of customer service.
Here is documentation on hot to drop ship in BC
https://docs.microsoft.com/en-us/dynamics365/business-central/sales-how-drop-shipment
Please provide what is missing from the standard BC functionality