Hello,
I recently installed Bootcamp on my external Thunderbolt SSD because both software and hardware (Windows 8.1 and the new Haswell rMBP) support booting from the external disk via EFI.
Unfortunately I can’t get VMware Fusion 6.0.2 to run this external Bootcamp in a Virtual Machine.
I create a new Machine, choose "More Options" -> "Install from Bootcamp" and sure enough, Fusion does detect the external drive as a valid Bootcamp installation. It then successfully creates a Boot Camp virtual machine, but when I try to boot that Virtual Machine it, it doesn’t detect a valid drive to boot from.
If needed I can provide the complete debug log. It would be nice to have VMware Fusion support external EFI Bootcamp installations soon.