It is possible using the extrude command.
The only thing is is that it would have to be drawn using polylines and they all must be joined. If you have joined all the polylines together then it will extrude to your required height.
To join the polylines select one of them and right click, now click polyline edit and select ALL other polylines. click OK.
Sorry if this is not explained simple enough for you to understand. Please get back if not