Use the options on the Variable Offset Surface dialog to select the four points on the outer boundary of the surface that you want to offset:
Offset position — Select each Offset Position and click on the outer boundary of the surface to position the four points, as shown in the example below. The
changes to
.
Enter the offset distance for each point in the text box alongside each
Offset position.
Preview — This displays the results of the offset on the surface.
OK — This creates the surface offset with the distances specified.