The costing/bill can be added from 2 screens:
1) Shipment Level-
Go to the Shipment tab and select Air/Sea/Land.
Click on the edit icon for your shipment.
Click on the accounting section in the shipment.
There you can add costing/bill using the Add Cost / Bill(AP) button.
2) Accounting Tab-
Go to the accounting tab and click Payable.
A drop-down will appear.
In the drop-down click on the Costing button.
Click on the edit button for the required shipment and update your costing/bill.
