Multiple Box accounts?

A local user currently has a box account with our corporate headquarters.  We want to use Box for our branch to share local files, and want to setup a separate Box account just for our office, but still allow that user to access both sets of files. 

How would this work on their computer?  Would Box appear twice in File Explorer?  I assume there would be 2 logins, but would they have to logout of one to access the other?  Using Windows 11. Can you please enlighten me?  Thank you.