Click Extended Surface 
on
the Surfaces toolbar or click Insert, Surface,
Extend.
In the PropertyManager:
Under Edges/Faces to Extend, select one or more edges or faces in the graphics area for Selected Face/Edges
.
You can extend a surface by selecting an edge, multiple edges, or a face.
To extend a surface:
Click Extended Surface on
the Surfaces toolbar or click Insert, Surface,
Extend.
In the PropertyManager:
Under
Edges/Faces to Extend, select
one or more edges or faces in the graphics area for Selected
Face/Edges .
For edges, the surface extends along the plane of the edge. For faces, the surface extends along all edges of the face except those connected to another face.
You can propagate extended surfaces to tangent
faces by clicking the Propagate 
callout which appears only if you select edges. 
Select an End Condition type:
Distance. Extends the surface by the
value you specify in Distance
.
Up to point. Extends the surface to
the point or vertex selected in the graphics area for Vertex
.
Up to surface. Extends the surface to
the surface or face selected in the graphics area for Surface/Face
.
Select an Extension Type:
Same surface. Extends the surface along the geometry of the surface.
Linear. Extends the surface tangent to the original surface along the edges.
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Extend edge using Same surface as the Extension Type. |
Extend edge using Linear as the Extension Type. |
Extend surface using the face as the Edges/Faces to Extend and Same surface as the Extension Type. |
Click OK 
.
