Robot - edit existing construction

I am looking for a way to edit the existing structure in Dynamo. Do you know some methods to import geometry, all panels, all nodes, etc. to the dynamo environment? Something similar to nodes in Revit version of dynamo which allows to import all elements in active view, all elements of category and override some elements.
The samples which are attached as examples to dynamo, only show how to model NEW construction - instead of editing existing.
Thank you!