Hey Brian.
First thing you may want to consider; look at the discovered assets you want to exclude -- make note of the Asset Type. That will be the "type" that you want to exclude. But, realize, if it's "Windows", you'll also exclude ALL Widows devices.
Something else to consider, opening the asset, there's a "Scan" tab that lists the way(s) the asset has been discovered, scanned, or attempted to be scanned. That might help you know how and which discovery method the asset is being discovered through.
Hope this helps with some pointers as to what to look for.
Tim
Tim N.
Lansweeper Employee