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Hi guys, I am new here, so please forgive any fault, i am working on rail way project in Bangladesh, i need to make cross srction for every chainage 25 meter apart (showed as CH as chainage number and CS as Cross Section number). all of the collected data are in XYZ coordinates. i have to create 3000 of these cross section by manual calculation. Can you guys please suggest me how can i do it easily,what software or what add-on do i have to use, i am using AutoCAD 2013 and AutoCAD Civil 3D 2012. I have attached the working file. (sorry cant make smaller then this) CS-409-805(Ch-140.025-150.00) Clean purged.dwg

Refer to this thread as background: http://forum.123dapp.com/123d/topics/how_to_i_slice_a_3d_into_a_2d_newbie_question I am a noob. Please do not assume I know much about AutoCad--honestly about an hours worth is all I know. I do have a couple of reference books. Here is the problem: I have a 3D model in the format of 123D (Freeware by Autocad). I converted this to .DXF then imported into AutoCad 2012 and saved it in .DWG format. The 3D model is of a crocodile. I wish to take cross-sections of this model so to generate width traverse sections from the longitudinal head to the tail of the animal. This is so I can form a model of the animal out of wire. So how to best do this? Apparently the model in .DXF/.DWG became a 2D "mesh" so I must first convert to a solid? (I say 'became' because originally it was in .123c format, but my version of Autocad 2012 does not recognize this format, so I had to convert to .DXF, which I believe rendered the 3D into a 2D mesh) Or can AutoCad take a 2D "mesh" and generate cross-sections? Top-down general advice is good but even better is a detailed step-by-step explanation of how to do this. I did "select" the entire animal and tried to make a "solid" out of it using a button icon on the ribbon panel (as opposed to a "surface") but I think I stopped prematurely--there was no progress bar so hard to tell. So then I guess you generate a cross-section once you generate the solid by doing what? is there a dialog box that ask for your end points (of the plane, defined by a line?) I appreciate any help I can get. I will check this thread in a few days as this is not urgent. Thank you very much.