Easiest is to use Fence->Delete Fence Contents->Clip. There are some videos it looks easy for small models but for normal/large models Microstation mesh editing tools are not capable to handle: https://www.youtube.com/watch?v=6ByMqpICcBw https://www.youtube.com/watch?v=C2Vw9b8l99E Also you could try to use this mesh plane as 3D water surface constraint .
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