Part Modeling > Edit Features > Extend > To Create a To Plane Surface Extension
  
To Create a To Plane Surface Extension
Use this procedure to extend a surface to a reference plane.
1. Select the boundary edge chain of the surface that you want to extend.
2. Click Model > Extend. The Extend tab opens.
3. Click . The collector appears.
4. Select a plane to which to extend the surface.
5. Click .