Creo Direct > Designing in the Creo Direct Environment > Working in Part Mode > Working with 3D Geometry > Manipulating Quilts and Surfaces > Extend > Example 2: Extending an Edge Along a Surface
  
Example 2: Extending an Edge Along a Surface
Approximate Method
The sample part is shown in Figure 1.
Figure 1: Sample Part
Figure 2
The following figure shows how the surface extends when you use the Approximate option. The surface extension as a boundary blend between the boundary edges of the original surface and the edges of the extension.