Isolate part of the point cloud for export in *.xyz?

How I can isolate just part of the point cloud to be exported.

In short I try to export the whole, but there must be some limitation because I can't see all the elevation that I need. Or the problem is some kind of elevation transformation. The points in the cloud have elevation near 160 and when exported ~200.
I do this to make random feature from the points, so I can project them to the CS. If there is easiest way, please tell.

PRT V8i SS2

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