Since the software is used a lot for conceptual work, it would be very helpful to have the MASTER model/proposal set so that if something like data/GIS/linework, is automatically added to all proposals - or at least be made available via layers (perhaps default turned off in each). I've been working on multiple concepts for a new road and having to add new data to each concept as it becomes available is very time consuming. I realize I could copy/paste to some extent, but it would be nice to have the MASTER proposal work just like Civil 3D's model space, pushed through into viewports.