Trimming Structural beams with Reference planes

This morning I have started with, what I thought would be easy Thing. Modeling some sloped wooden Roofs.
I have dwg file with lines that represent beams and would like to use that.
I have a Problem when i come to a Point where i want to trim structural beams with reference plane in Dynamo. I Need my beam end to be vertical to the surface of floor, and because it is sloped in Revit the easier way is to cut it with Reference Plane.
I have also tried to create void Family through Dynamo but without any luck?
Does anyone have any idea how it can be done through Dynamo so that i do not have to click on every single beam in Revit model


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