In the latter case we would open the 2D drawing and hide any unnecessary layers. We only need half of the drawing, so we would create a vertical centre line and delete one half of the drawing. Then resave the document. Next we switch to the 3D workspace using the Workspace Shifter button on the bottom right of the Status bar. This will open some 3D commands on the top Ribbon, adding to the already present 2D functions.
Read full article