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Topics related to the Grasshopper-ARCHICAD Connection and the various tasks that can be achieved with it.

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I am trying to find a way to change a certain property of a wall from a grasshopper. To be more precisse, every wall will have a custom property I predifined, and I would select all of the walls, deconstruct them in grasshopper, find surface and materials and based on some calculation I would fill mentioned custom property with a custom value. My question is how to do that on existing wall, without creating a new one?