Record Updating

Hello,

Trying to get the scope of a potentially massive data hygiene project here at The Cleveland Orchestra.  Is there a utility or protocol within tessitura currently that would allow me to upload some type of template with patron ID and update that patrons information automatically in one massive bulk upload.  or is the only way this can be done is a patron by patron basis (i find that very hard to believe but anything is possible..).  Any help would be greatly appreciated!