.lin area attribute definition attributes autocad autocad lt autocad mep autocad vba upgradation base point beginner blocks bmx command copy create creating data extraction dem dimensions displacement edgesurf export feature table fillet command problem first point frame import insert command inventor inventor 08 label lag layer layers layout lines linetype line types lisp lowerleft zoomwindow lsp management memory model move multiple new user overflow parcel numbers pdf pline polyline profile propeller random color colours reference rotate script sketch slow surface utilities switch tables tabs text hatching timer trace vba text find replace viewports width text lisp