Creating 3D model from AutoCAD 2D Section

Hi,

I just started using the 3ds max, trying to create 3D geological models from AutoCAD 2D sections. Basically, I am able to put them (sections) in 3D, however I can not edit or create solids between the same layers.

Could you please send me some ideas either through this forum or contacting me at kallfa@rogers.com.

Regards