If you have file system access you could (with nothing running on them) snarf the files from the IMAP user folders to a local folder then 'Add mailbox to list'.
Otherwise via IMAP it is one folder at a time
For the record the IMAPSize utility at http://www.broobles.com/imapsize/ does a great job of manipulating IMAP folder data.
The backup function will copy selected folders to the local hard drive.
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