# SURFOFFSET [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [What's new](Help%20System/GSTARCAD/2021/What's%20new/(What's%20new).md) You can input SURFOFFSET command or click Ribbon – Surface -SURFOFFSET, to create a parallel surface at a specified distance from the original surface.  After selecting the surface and pressing enter, you will get 4 options (Flip direction, Both sides, Solid, Expression) in the command line and dynamic input box. You can **Offset the surface in one direction** (the arrows will show on one side of the surface) by entering a distance or select the point on the drawing.  If you type**“Flip direction”**, the arrows will flip to another side.  Ifyou type **“Both sides”**, you can **Offset the surface in both directions**(the arrows will show on both sides of the surfaces)  Ifyou type **“Solid”**, you can **Generate the surface to a solid after the offset**  If you type **“Expression”,**you can enter a formula or equation to specify the distance of the surface offset.  **SURFACEASSOCIATICITY**: System Variable,when the value is 1, Expression option will be displayed.This option does not update the offset distance default value the next time you enter the command. **SURFACEMODELINGMODE:** System Variable, when the value is 1, the surface will be a NURBS surface. --- Gstarsoft Co.,Ltd