DRAFT Create a view without visualizing negatives

Hi there!
I'm using PDMS 12.1, and i need to create a view in Draft, but i dont want to visualize the negative boxes and cylinders, is there any way to do this?
Thanks.:tennis:

ACCESS LINK
http://macro-pml-pdms-e3d.com/2015/02/24/auto-extracting-pipe-support-location-drawing-in-pdms/