You can use NURBS modeling for the precise creation of non-organic features. They are a good place to begin 3D modeling with curves and surfaces for the first time.
This video describes how to create and delete NURBS surfaces in Create VR.
When using the Surface tool to create a surface, note that:
Press the Snap CV icon on the Tool Hand to enable CV snapping.
As you create the surface, you can snap it to existing CVs on the curve.
Position one hand near the first CV you want the surface to snap to.
The stylus highlights the CV the surface will snap to. The Snap CV icon also highlights.
Pull the trigger on the Tool Hand to snap the surface CVs to the highlighted CVs, then use the Global Hand to guide the surface creation.
Press the green checkmark on the Tool Hand to complete.
Select the Revolve tool . A dashed line is attached to the Tool Hand. This is the axis on which you will create the revolved surface.
Position the axis freely or along a direction vector, tapping left or right to choose between the X, Y, and Z axis.
Pull the trigger to place the axis, then hold the trigger and drag to draw a revolved surface.