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Just a comment most files like this don't have a double line entry makes life a bit easier. Can remove double lines in a word processor and save as a txt file. x y z 21.0937p1 200.4997p1 0p1 22.0937p2 201.4997p2 0p2 23.0937p3 203.4997p3 0p3 23.0807p4 203.4797p4 0p4 Do you have more points ? It looks a bit too simple, what about lines next p1 p7 p8 p9, p3 p7 and so on, multiple lines. If from an Excel then post the Excel.

Code what's that for ? Join Fillet R 0.4 P pickobject enter All done

"complex feature survey" one of the things not mentioned is the import from your total station data recorder, this way all line work is strung automatically, points set contourable or not, blocks inserted on those points and breaklines say by layer naming can be set. Do you have access to the field data, which total station ? There should be people here who can provide a CIV3D dwt set up for you to match your total station. Something I have and Autodesk did not do it is Import Description Keys, from Excel. You can export but not import.

Code updated above ... give it a try!