How to create line through any plane, one point and parallel xy plane

Hi guys
I have any plane (rectangle) and one point into this plane
I want to create red line as picture and parallel xy plane
Thanks you very much

So just to clarify, you are looking for the horizontal Plane.AtPoint where the Geometry.Intersect happens? To create a red Line.ByStartAndEndpoint

Can you provide an example of what you have tried so far?

Thank you for your clear instructions, I have completed it

Glad to hear :grinning: Any chance of posting a screenshot of the completed graph for the benefit of future topic viewers?

Of course, this is script I carried out
Thank you and hope will be given your support in next time

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