Extend Surface
You can extend a surface by selecting an edge, multiple edges, or a face.
To extend a surface:
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Click Extended Surface 
on the Surfaces toolbar or click Insert, Surface, Extend.
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In the PropertyManager:
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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.
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Select an End Condition type:
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Distance. Extends the surface by the value you specify in Distance 
.
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Up to point. Extends the surface to the point or vertex selected in the graphics area for Vertex 
.
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Up to surface. Extends the surface to the surface or face selected in the graphics area for Surface/Face 
.
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Select an Extension Type:
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Extend edge using Same surface as the Extension Type.
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Extend edge using Linear as the Extension Type.
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Extend surface using the face as the Edges/Faces to Extend and Same surface as the Extension Type.
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Click 
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