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I am sure there is a way, whether it be lisp routine, or feature already within autocad, but I have yet to find it. What I want to do is be able to take a point that represents a grade and determine the elevation along a line to another point representing a lower or higher grade. Typically I would get the measurement between the points and just do the math. It would be great if you could select a point..be prompted to select (+ or -) and then enter a percentage, and then when you end the line it gives you a + number or a -number in which represents the rise or fall from point A to B. To take it a step further, not that I really need it, but would be cool, is if you could select points along that line and it give you an elevation for that point. Does anyone have any suggestions, or know of a lisp routine that does exactly this, and something similar. It would be huge in my career if such thing exists or can exist. Please point me in the right direction if you you of anything!!! Thank you, Matt