Mike,
Have you tried selecting File à Properties à Del Model from the Pro-E
drawing file? The drawing property options are shown in the attached JPEG.
Trying deleting the part model to see if it will break the link.
As for Pro/Intralink, it has been a few years since I have used it, so I
cannot answer that question. I use DesignDataManager (DDM) as an
alternative.
Regards,
Chris Thompson
Pro-E Wildfire 2.0 & 3.0
SolidWorks Office Premium 2007 & 2009