Use Bridge Curve in a 2-D sketch to create a smooth (G2) spline that connects two selected sketch curves. Bridge Curve is typically used to create contiguous geometry. The following image shows a Bridge Curve closing a gap to create contiguous geometry for patching a surface.

Bridge Curve can also generate a curve with smooth (G2) continuity to close an open loop. Use the connected curves to define a patching surface or a runoff surface.
Bridge Curve
To to patch a surface containing non-continuous edges that must not be connected, use the Bridge Curve tool to connect curves and maintain G2 continuity.
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Bridge Curve
Connects curves by G2 continuity.
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On the Sketch tab, Draw panel
click Bridge
Curve. | |