After successfully creating an STD order, you can add a new shipment by clicking the "Add New Shipment" button in the newly created SO.
Adding a new shipment on the Sales Order will allow you to invoice this Sales Order per Shipment.
Just navigate to the Sales screen and search for the existing Sales Order you wish to add a shipment.
Click on Add New Shipment.
The Add New Shipment button will give you a blank shipment to which you can add items, change the warehouse, and other information while keeping the existing SO number. ie. 44680-2.
Please keep in mind that the dash number represents the shipment identification number.
Screenshot showing the SO#44680-2
