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Extracting desired LiDAR points with Quick Terrain Modeler

There may not be a 'better' or 'easier' way to do what I'm asking, but I figured I'd give it a shot and ask around.

I'm using Quick Terrain Modeler v8.0.3.4 (x64) and have used the ZEB1 Handheld LiDAR wand to create a cloud point dataset. As can be seen from the images, the scan is from a storage unit that holds salt. My end-state is to use the "Volume Calculation Analysis" tool in QTM in order to determine how much salt is in this (and any other) particular unit. I have successfully done this, my question however is:

"Is there an easier way to remove LiDAR points that are not pertinent to the volume calculation?"

For example, the way I did it was by using the 'Polygon (Screen)' tool, selecting points that were not salt, and then using the 'Cut' tool, repeat, etc. This is a very tedious process and certainly not an extremely effective way to go about obtaining or achieving the same results every iteration.

Many thanks in advance for anyone's help or advice.

Untouched salt shed scan

Finished product, salt only

Polygon/Cut