3d model from Revit and would like to make it into a solid parametric cell in microstation.

I received a 3d model from Revit and would like to make it into a solid parametric cell to use in OBM. I imported the model from a dxf format into microstation and it came in as a shared cell. When I dropped it, it became just plain separate lines and line strings. Do I just have to retrace all of the elements to make it a solid? Model is attached.

5241.Pier cap 01.dgn