What command in NX can you use to create a surface from an open set of connected planar curves?

The command to create a surface from an open set of connected planar curves is the "Bounded Plane" command. This command is specifically designed to take a set of edges or curves that delineate the boundary of a planar area and generate a surface that fills in that area.

When utilizing Bounded Plane, it’s important to ensure that the curves are indeed connected and form a closed boundary in order to create a valid surface. This command is particularly useful in situations where you want to generate a surface that sits flat on the defined curves.

Options such as Studio Surface and Ruled Surface serve different purposes. Studio Surface is typically used to create complex, freeform surfaces that require advanced manipulation, while Ruled Surface generates a surface between two curves, which can be open but does not strictly create a surface from a set of curves like Bounded Plane does. The Sheet command could also create surfaces, but it is generally not used just for defining surfaces from open curves as this command has other broader applications regarding sheet bodies in modeling.