In the same way that you can attach (xref) dwg files in Civil3D, with the option to not lock the source files, it would be great to be able to attach coordination models (NWCs) in your current Civil3D model, without locking them too. This way you can xref in different NWCs from different software into your session while keeping the model light and performant. And allow the NWCs to be replaced by users anytime as the models evolve.
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