As far as i understand MacOS doesn't have that capability, although for running parallels it might not be strictly necessary.
using macports and installing e2fsprogs with a small patch:
diff -r e2fsprogs-1.41.12/misc/Makefile e2fsprogs-1.41.12.patched/misc/Makefile
> $(LIBEXT2FS) $(LIBCOM_ERR)
you can use blkid -s UUID /dev/rdisk* to enumerate partitions, disks and get their respective uuids (for any supported file-system which is quite a few).
After that a adding a softlink with 'ln -s' or creating an alternate device node with mknod
should work (and then reference that psudo-/clone-device from Parallels). I've done similar tricks with Fusion, but I haven't got Paralells installed right now (so I can't test)
stat -f "%Sr %Z" /dev/rdisk*s* gives you a map over device to major,minor to be used if
parallels doesn't accept a soft-link to the device.
which can be used as in the following example:
some@host:/e2fsprogs-1.41.12$ blkid -s UUID /dev/rdisk*s*
some@host:/e2fsprogs-1.41.12$ stat -f "%Sr %Z" /dev/rdisk*
# okay, UUID 51FC4E72-BFA9-4DBD-9A5C-0E5H731DB0ED is a partition
# on the disk we want to use. so we make a 'private' device node
# pointing to the device containing that partition.
some@host:/e2fsprogs-1.41.12$ sudo mknod /dev/pdisk1 b 14 3
# just a quick verify that the mknod worked as expected ...
some@host:/~$ sudo dd if=/dev/rdisk1 count=10 2>/dev/null | md5
some@host:/~$ sudo dd if=/dev/pdisk1 count=10 2>/dev/null | md5
Now the only thing left is to write a script and using the instructions in http://support.apple.com/kb/HT2420?viewlocale=en_US to make it run at boot.
But that will be for somebody else to finish ...