Using Parallels w/ external USB drive

Hi

I am currently have my Mac configured with a Boot Camp drive. I can boot directly from this via "option key" or can run Windows via Parallels. Of course with all the Windows upgrades, etc. I am out of space on my Boot Camp partition.

My solution is the addition of a 200 gig SD card (MacAir w/ SD slot).

Of course Boot Camp doesn't support making this a Windows drive but I did find a video source to get this drive setup with Windows.

My question is, once I have this drive setup for Windows - How can I get Parallels to recognize Windows in this location so I can also run Windows under Parallels?

Thx Bill

 

I see that a few folks have looked at my post but no ideas on a solution. I have found a way to create a bootable Window drive on the SD card/drive - if I do that can I point Parallels to that drive and use as a virtual machine?