Here you will find information on how containers related to a bill of lading are tracked.
You may not specify containers contained in a bill of lading for which you would like to receive updates. When tracking by bill of lading the Vizion api will return all containers related to the bill of lading submitted. If a bill of lading contains 10 containers the Vizion api will generate 11 references for you: 1 reference for the bill of lading submitted and 10 references, 1 for each container.
To track a specified set of containers you may begin tracking each container individually. See more information on the parent/child relationship between bill of lading and container references here.