Choose Surfacing tab→Surfaces group→Bounded Surface 
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Select the curves or edges that define the boundary of the surface you want to construct, then click the Accept (check mark) button.
Select the adjacent faces to which the new bounded surface must be tangent.
Finish the feature.
Tip:
When the Face Tangency option is set, the adjacent faces are automatically selected. You can then deselect any faces which you do not want the new bounded surface to be tangent.