The OrientCrvToEdge command copies and aligns a curve to a surface edge.
Steps
Select a curve near an end.
Select a target surface edge.
Pick target edge points along the edge to align the curve
Command-line options
Copy: Specifies whether or not the objects are copied. A plus sign 
appears at the cursor when copy mode is on.
The RememberCopyOptions command determines whether the selected option is used as the default.
FlipSurface: Changes the normal direction of the surface.
ReverseCurve: Changes the direction of the curve.
SubCrv: Type subcrv to select part of a curve as input.
For more information, please refer to the Rhino documentation.
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