Bulk uploads are typically used for Enterprises on-boarding more than 10 new users at a time, where an Admin can specify the username, password, meeting ID, etc. needed for account creation. More info can be found here.
This upload is performed by our BlueJeans provisioning team. You would just need to provide the information for the .csv file. Please reach out to your Customer Success Manager for the bulk upload template, instructions, and to coordinate when you would like these users created.