Red0
Command
line: red0
Description:
reduce
selected entities to plan of level 0
TopoLT
toolbar: 
Menu:
TopoLT » Transformations » Reduce to plan of level 0
By applying this command entities: lines, polylines
(including the 3D ones), multilines, circles, texts and blocks get to plan of
level 0.000
Command is useful if you want to transform drawings built 3D
in drawings 2D.