Select individual points in the point cloud then assign to another Point Group

Is it possible to just select individual points in a point cloud layer (not a selection of an area using the Edit Densify Point Cloud tool) and assign these points to another Point Group. The purpose is to select individual points at 5-10m intervals and along change of grades over an area then export only this group to a third party software to create contours. Thanks in advance.

If my understanding is correct, it will be difficult to select points at 5-10 m intervals to create contours using third-party software; however, I will pass your needs to our development team for future development. You may already know this, but just in case, I will share the webpage that explains how to generate contour lines.

Kind regards,