Sonar Discovery and Ignore List

My organization just purchased NPM and I am responsible for setting up the monitoring for 4500 devices. I noticed that when a device is discovered via Sonar Discovery and I import the node and all related interfaces, volumes, etc that the remaining interfaces, volumes, etc that I did not import appear as "changed" in the discovery results page. Is there a way to automatically have the interfaces, volumes, etc that were not imported placed into the Ignore List?

Any feedback is greatly appreciated.

Tony