I have 2 concentric tubes. I placed a plane above them and then attempted to cut out a 1/2" hole through both of them...the distance of the cutout was beyond the tubes.

The cutout did not go through the inner tube but did go through the outside tube fine (enter and leaving teh tube). I used the option to update parts (write capability to parts files).

Not quite sure why the inner tube was not updated with the 1/2" hole.