I posted a related inquiry here:
communities.bentley.com/.../239692.aspx
Hopefully there are videos and/or documents forthcoming that outline these workflows.
Based on the past workflows for using Civil Platform technology, I assume we have to convert all the models into formats compatible with the legacy tools and use them to produce final documents.
I'm not using SS3 now so I don't know if there are tools to synchronize the data after it has been converted.