The OffsetSrf command copies a surface or polysurface so that locations on the copied surface are the same specified distance from the original surface.
Steps
Select a surface or polysurface.
Infinite Plane: Type IP for InfinitePlane options.
Type the offset distance, and press Enter.
Command-line options
Distance: Sets the offset distance.
Corner: Specifies how offset corner continuity handled. These options only apply if the offset direction is to the "outside" as shown in the image.
Sharp: Curves offset to the outside of a corner will be extended to meet at sharp corners with position (G0) continuity.
Round: Curves offset to the outside of a corner will be filled with arc segments with tangent (G1) continuity.
ThroughPoint: Offsets through a picked point instead of at a distance.
FlipAll: Flips the offset direction of all selected surfaces. Arrows indicate the positive offset direction.
Solid: Makes a closed solid from the input and offset surfaces by lofting a ruled surface between all of the matching edges.
Loose (Surfaces only): The control point structure of the offset surface is identical to the original surface.
Tolerance: Sets the tolerance for the offset surface. Type 0 to use the default tolerance.
BothSides: Draws the offset on both sides of the original.
DeleteInput: Deletes (Yes) or keeps (No) the input objects.
For more information, please refer to the Rhino documentation.
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