The Trim function allows you to cut a piece using another piece or an open contour. To cut a piece, the cutting pieces and the piece to be trimmed need to be overlapped. The first selected piece(s) is/are the trimming pieces, whereas the last piece of the selection is the piece to be trimmed.
When using the Trim with proportional grading function, in the case of the graded pieces, the newly-created points have the grading rules calculated proportionally.