Clipping point clouds with element

Hi.

I have scanned a secant pile wall and now I am trying to clip the point cloud with an element. The element is constructed by lines defining different distances from the front of the pile wall. I have made a shape (both complex and simpel). A shape that has many bends and corners, 

My problems is that the clipping is not working - what am I doing wrong? Are there any limitations to the use of a element? If I make a much smaller and simpler shape I can get it to Work. But it will take me hours to clip the wall if I have to do the clipping that way.

Hope someone can help me!

I am using V8i SS3. Do I need Descartes?

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  • A bit more information.
    I need to export the clipped area. I have done similar before - but with simpler elements.

    If I attach a new dgn with the point cloud I can clip the reference with the element and the point cloud in the reference gets clipped. But I cannot export the point cloud in the reference fil and if I merge the clipped reference into the master I merge the entire point cloud and not only the clipped area.
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  • A bit more information.
    I need to export the clipped area. I have done similar before - but with simpler elements.

    If I attach a new dgn with the point cloud I can clip the reference with the element and the point cloud in the reference gets clipped. But I cannot export the point cloud in the reference fil and if I merge the clipped reference into the master I merge the entire point cloud and not only the clipped area.
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