Thank you for your reply, In fact my problem is : I have a survey Data for a tunnel (ST Offset Elevation) basis in this data I would like to create the existing tunnel and so far I will check the structural gauge. I tried to use import text wizard - st + off + Elevation - point type "Exterior"- Penorder "one to zeros" and I added a new column for the pencode 1 for beginning and zero on the line. BRT imported the points but when I triangulate It's a mess. Do you have a solution for this problem. Many Thanks
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