how to elevation interpolation picking updating cumilative | offset in autocad using lisp | CTL74

how to elevation interpolation picking updating cumilative | offset in autocad using lisp | CTL74 Lisp Downloading Link : https://drive.google.com/uc?export=do... if useful, subscribe and it will be appreciated Subscribe Link for all other Lisp :    / @cadtype   Lisp for Fast and accuracy of the AutoCad work Thank you very much #CadType