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Perhaps use vla-sendcommand?: (defun c:test () (if (setq *entselLst* (entsel)) (vla-sendcommand (vla-get-activedocument (vlax-get-acad-object)) "_.offset _erase _no _through !*entselLst* " ) ) (princ) )

For me that's 3D, anything that uses all 3 axis is 3D, solids are another thing altogether but there is such a thing as 2D solids in LT. I draw just about everything in 3D using LT. The big difference is the available tools included with LT, so it is a question of how much time you are willing to put into a drawing to get the results. LT does have the "hide" command so views with hidden line removal are also possible. All by it's self just using LT you can do a lot, but add in the power of Excel and you can do it quicker (if you don't count the weeks and months of programming ).

if you are using Civ3D you can not just purge layers they will remain do purgestyles 1st then purge. 200 down to 20.