Please find the below steps to Convert the Direct Shipment to Back to Back Shipment:
Steps:
1. Go to the Shipment in which need to convert and click on the "Edit" button
2. After clicking on the Edit button scroll the Edit view and click on the "Issue an HBL for this MBL" button
3. After clicking on the button Add the House level details and go back to the screen
4. Now system shows that shipment as Back to back