Cannot trim surface

I have been trying to trim this deck board for the past hour and due to such lack of success, decided to post it here. The cutting line is on purple and I want to trim out the outer side of the board, leaving the part that is to the right of the curve. Appreciate any help!Trim.3dm (60.0 KB)

Hello - use either the top or the bottom part of the curve, leave out the verticals. In Top use Trim or WireCut. Does that do what you want?