Express Entries: delete entries in a batch

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I have a client that receives hundred of registrants through a series of Express Object, on a quarterly/seasonal basis. I actually have four Express objects, one for each season. We've now cycled through the year, and we're preparing for a second run for the fall season and need to purge that express object of hundreds of entries from last year. I only see a means of deleting an individual Express entry. Please tell me there is a means to select multiple, or an entire batch of entries and delete them. Deleting them one at a time would be a painfully tedious process.