Part Modeling > Edit Features > Offset > Offset Curve > To Offset a Curve Along a Surface
  
To Offset a Curve Along a Surface
1. Select a curve and click Model > Offset. The surface is highlighted, and the Offset tab opens. The selected curve appears in the Offset curve collector on the References tab.
 
* If you are using a chain set as a reference and you want to modify it, click Details on the References tab and use the Chain dialog box.
2. Select to offset the curve in the direction along the reference surface.
3. Click the Reference quilt collector and select a quilt or surface to act as a reference for the offset curve. By default, the quilt or surface on which the offset curve is located is selected as the reference.
4. Enter an offset value in the box.
5. Click to flip the direction of the offset, if necessary.
6. On the Measurements tab, specify the measurement type as either (normal to curve) or (parallel to plane). If you select , you must select a reference plane.
7. Click to complete the offset curve.