This may be the wrong location for this question but its worth a shot. I imported a large shapefile of LIdar contours into Civil 3D. I was attempting to copy a small section of the contours and ended up detaching them from the base shapefile. Now, wherever this shapefile is being used the 6 contour lines I tried to copy are gone. I beleive I expolded them from the shapefile and when the drawing saved it saved over the referenced shapefile. I am wondering if I can add these lines back into the shapefile. I have the linework in the drawing but they are no longer attached to the shapfile.
Any help would be great!
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