Remove Points from Point Blocks (3D)
Point
Cloud Tool Tab 
Icon
(Part Level)
Use this command to remove
(split) a set of points from one or more existing point blocks. The
points are "picked" by enclosing them with a series of resizable
spherical volumes.
An optional input is available to delete the selected points (i.e., trim the point block). Otherwise the selected points are retained as separate point blocks. This command works across multiple point blocks. Each will be split or trimmed as desired.
Radius - Specify the radius within which points are selected. When you select a point, all points within this spherical radius will also be selected.
Delete input points - Check this box to delete the selected points. Otherwise the selected points are retained as separate point blocks.
