Thank you for your reply.
I received an IFC from a local manufacturer. In this IFC there are 114 windows modeled. Each window is modeled as one Assembly.
When importing this IFC in Revit, the Assemblies explode and leaving the window behind in multiple pieces (pieces of Structural Framings). Each piece has his own IfcGUID. My IFC import options are fine, because other IFC projects do load whole Assemblies in Revit.
I managed to get all the Assembly marks in Excel.
My plan is to assign all the marks in Dolumn B to the Structural Framing IfcGUID’s in column D with Element.SetParameterByName. So all Structural Framing parts will get a mark. I was trying to make sub lists in Dynamo with the mark on the top of the list and the Structural Framing IFC GUID’s beneath it and after that try to assign the mark somehow to the Structural Framing IFC GUID’s.
I am kinda new to Dynamo, so I am not sure what the best workflow is. That’s also why I used List.Map.
I hope this explains my goal better.