Another option would be to use the utility mentioned here: http://community.landesk.com/support/docs/DOC-5039
to create a query to exclude your 100 devices, after the query is imported, edit it to add the ones you do want to target.
Another option would be to use the utility mentioned here: http://community.landesk.com/support/docs/DOC-5039
to create a query to exclude your 100 devices, after the query is imported, edit it to add the ones you do want to target.