AutoCAD to Open Roads

Hi!

I have the topo details & proposed  Centerline in an AutoCAD file. I have attached this CAD file as reference & prepared the terrain model. To proceed with horizontal alignment design is there a way to convert the proposed centerline( already available in CAD whihc i have referenced for preparing terrain model) into alignment, in open roads or do I have to recreate the CL separately?

Thanks in Advance!