Northern Trail Outfitters has five business units in their Marketing Cloud account.

To configure multiple business units in Marketing Cloud to use the same SFTP directory, the most efficient method is to copy the parent SFTP user credentials into each child business unit. This approach ensures all business units access the same SFTP directory for file transfers, maintaining consistency and simplifying management of file access across the business units. This setup avoids the complexity and maintenance of separate SFTP users for each business unit, streamlining operations.