Copying multiple SUDA files into one master file.

We had a multi-mile interstate project.  We had multiple drainage engineers working on different sections of the drainage design.  Our client requires a clean hydro.dgn deliverable with all the drainage elements showing and no reference files attached. 

We were unable to copy the SUDA drainage elements of our test section into the master hydro.dgn file.  I ended up redrawing the SUDA drainage in by hand.  We did the rest of the drainage design in InRoads Storm and Sanitary. 

Is there a way in SUDA to have multiple drainage engineers working on design, and then view/show the work in a master hydro.dgn file without having reference files in it? 

Sincerely,

Charles