When you offset a curve normal to the reference surface, you can select a graph as a reference for the offset. On the Options tab, activate the Graph collector and either select a graph or pause the Offset Curve tool and create a graph. The default graph, the unit graph, is a constant line with a value of 1.

After you select or create a graph, enter a value in the Scale box. Click to reverse the direction of the graph, if necessary.

You can also create a graph to use as a reference for the offset curve. The graph, which you create by pausing the Offset tool and entering Sketcher, does not appear in the graphics window but is represented in the Model Tree as a group () with the offset curve.