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Steven the text appears to be the invert levels of pipes so is underground, I can not see ground level text hence why I said all at 0.0. Yeah I am a CIVIL engineer. The answer seems to be go back a few steps how was the original dwg made ? If it was traced over aerial photo etc then no levels, in saying that CIV3D has various tools to overlay linework over a 3d surface, the 3d surface maybe from a source like Google maps. Same with image can drape over surface. I did 1 3d of a building as a simple example of adding structures. The question is like reverse engineer but there is no data. This image is a 3D surface but linework is 2D done on purpose that way.

You can write in VBA if you want just make sure you download the VBA extension. Something like this NOTE defun name has 2 "LL" as "Dimali" is a valid command name so caught me out for a couple of minutes always worth checking defun names. Just press Enter to exit or Esc (defun c:dimalli ( / ) (while (setq pt1 (getpoint "\npick 1st point ")) (setq pt2 (getpoint "\npick 2nd point")) (setq pt3 (getpoint pt1 "\nPick dim line point ")) (command "DIMALIGNED" pt1 pt2 pt3) ) (princ) )

You can add the grdraw function to create a rubber band for a better review before specifying the side point like this: (setq pt2 (getpoint "\n2nd point :" pt1)) (not (grdraw pt1 pt2 2)) ;; this expression (setq pt3 (getpoint "\nSpecify offset side :"))