how can i remove unwanted trimed objects?

 From:  BlackBird
6952.1 
Hi,
how can i remove unwanted trimed objects and restore the original surface?





i cut out the FrontWindow and like to remove the trim on the backside of the car. i canot delet the lines(untrim)
can i use extruded curves as a "local" timobject. a trim that do not go throu evereything?
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