This free lisp is useful while working with Land Survey Drawings. After the drawing is prepared, if Z Value (Elevation) of the points in the drawing to be changed it will be very difficult. Using this free lisp you can add specified value to all the selected entities. Let us say there are 3 entities with z value 100.23, 106.34, 107.34 when you add value 100 to these entities using this lisp their value will become 200.23, 206.34 and 207.34 respectively.
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