Creates a surface from a network of curves.
Steps:
Select curves.
Note: All curves in one direction have to cross all curves in the other direction and cannot cross each other.
Options
NoAutoSort
Turns off automatic sorting so you can select the curves manually.
Tolerances
Edge Curves
Sets the tolerance for the edge curves. The edges of the surface will be within this value from the edge curves. The default is the system tolerance.
Interior Curves
Sets the tolerance for the interior curves. The interior of the curve's surface will be within this value. The default is the system tolerance x 10.
If the curves themselves are farther apart from each other than the tolerance values, the best guess is made at the surface.
Angle
If the edge curves are surface edges, and you want the surface matching the adjacent surfaces with tangency or curvature continuity, this is the accuracy used to match the surface normals.
Edge Matching
Determines how the edges match the input geometry.
Loose
The surface will match to the input edge curves with less accuracy.

History enabled…Changing the input objects changes the output objects. 
Surface > Surface from Network of Curves Surface > Curve Network 