Use the Four Point Surface command to create a surface by specifying four
points.
This is useful for creating base surfaces that support the surface based
Class-A workflow.
You can easily modify such a surface by increasing the degree and patch into a
more complex surface with the desired shape.
You must follow these point specifying conditions: No three selected points
can be collinear. No two selected points can be the same or at the very same
location in space. Four points must be specified to create the surface. If you
specify three or fewer points an error message is displayed.
How four points surface command works in Nx Siemens mentioned in Video?