Trim
Point Block 
Point
Cloud Tool Tab
Icon
(Part Level)
Use this command to trim a point block to a datum plane, planar face or a sketch. First select the point block then select the plane. An arrow will indicate what side of the point block will be kept. You can change the direction of the arrow using the Flip side to keep option. Any number of point block objects may be split simultaneously via any combination of datum planes, planar faces, and sketches.
