Hi @Trav,
I just found out that NamedSelections are not saved to the file, if I use Export Selected… within the UI or do the export in RhinoCommon. Is this behaviour how you want it to be? It would be great, if the named selections can be saved as well. For our finite element analysis workflows it makes sense to only save a portion of the model with named selections containing these objects.
I used the following options in the UI: