If you create a new shipment that is a duplicate of a previous shipment, or you have saved the box content information in the PackList Template format, you can upload the box content information directly.

See: https://help.scanpower.com/en/support/solutions/articles/11000116864-pack-list-upload-template

and: https://help.scanpower.com/en/support/solutions/articles/11000116762-download-a-pack-list-for-shipment-in-new-boxt

Click on Upload Pack List:

The box contents will be processed and boxes created.