I have a bridge model imported from AutoCAD into MIDAS CIM. However, the bridge deck is made of solid element. I would like to change the solid element into frame element which is located at the top centerline of the deck box,(i.e. the road alignment) for further structural analysis in MIDAS Civil NX. Is there any ways to draw a line along the centerline of deck box in MIDAS CIM, then I can import the file into MIDAS Civil NX for structural design?