Copying won't work, I know you can import an existing windows machine into Parallels but exporting it?
It might be possible mounting the disk in OS X and then use Disk utility to restore that image to a bootcamp partition.
I did not respond to you before because I don't have Parallels so I can't give you advise on this, I do know though that you can not copy the image, that is pure nonsense and won't work.
Other's can probably answer this question better than me.
You could also do research yourself, for instance :
MRoogle