As a sponsor that moves between schools, how can I manage these separate locations?

Unfortunately, currently Bookshare does require a unique email address per account.  If the schools you work with are all within the same school district it may be best to create a single district wide account.

However, if you work with multiple districts, or if each school wishes to have its own account, it is necessary to be added as a sponsor onto each account using a unique email address for each one.