Hey,
So the pink group… if you want to manually select some walls, rather than get every single wall in the view, you can use that… the graph will run fine if nothing is selected and the ‘auto’ boolean is set to true.
Dimension.GetReferenceElements is in Rhythm. Elements.Delete is in Archi-lab, if you already have those packages just search again in your browser and you should be able to re-find them.