If your drawing is regular object lines, not shaded, then you might try this. I think this would be easier in the assembly file, but you can also do this in the drawing file:
Create sketches to make object lines of the part you want to be "invisible". Pick that part in the assembly file and hide it, not suppress it. This also gives you the control of showing only the most pertinent aspects of the transparent part. I'd do this in the assembly file because it will be very easy to control the display of these sketches and of the transparent part. You might want to do this on a special configuration of the assembly file.
- - -Dennyd