Creo Interactive Surface Design (Style) > Surfaces > To Create a Boundary Surface
  
To Create a Boundary Surface
1. Click Style > Surface. The Surface tab opens.
2. Click the collector and select at least two chains. A preview surface is displayed.
 
* The chains must intersect to form a continuous boundary.
3. To add internal curves, click the collector, and then select one or more internal curves.
4. To modify a boundary or internal chain, trim or extend it.
5. To adjust the parameterization of the surface, click and add reparameterization curves.
6. Click .