Remove from a task ..

Inside DS 7.5 there is a task available called "Add to Filter". By attaching this to a Server side script I can add machines to a specific filter based on a computer list provided by the SQL query.

What I am looking for is the exact opposite of what it offered, I want to remove a machine from a specific filter when the query results come back a "Remove from Filter". Is this even possible ? I've not been successful in pulling any information using Chevron to see the guts behind the "Add to Filter" task.

Any help anyone ?