Deleting only specific LiDAR points in Quick Terrain Modeler with Mensuration tool

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I'm using Quick Terrain Modeler 64-bit v8.0.3.4 - I have a set of LiDAR data that has some points that I want to delete, but due to their location it is hard (if not impossible) to delete them by merely using the 'Select Polygon (Screen)' tool without deleting other desired points. So, the way around it is to use the 'Start Mensuration' tool and then select 'Profile Analysis Tool' in order to cut away specific points. However, this can be a bit tedious and not always a one-shot process. I found that while in the Profile Analysis you can select 'Mask to Area in 3D', in which (temporarily) only the selected area of interest is shown. Once in this view, I choose the 'Select Polygon (Screen)' tool again and select the bad points and then cut them. However, this cut still deletes the points behind the bad ones, even though I've temporarily made everything else disappear.

So my question is this: Is there a way use the 'Select Polygon (Screen)' and 'Cut' tools in conjunction with the 'Mask to Area in 3D' selection, without cutting/deleting points that are not visible/in the area of interest?

Here's an example of what I'm talking about. The first picture is with 'Mask to Area in 3D' turned on and I'm cutting the faulty points. The second picture is showing the unintended cut, after turning off 'Mask to Area in 3D'.





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