Surface Face Fillet
To create a face fillet between surfaces:
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Create two surfaces (the surfaces need not be adjacent).
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Click Fillet 
on the Features toolbar, or click Insert, Surface, Fillet/Round.
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In the PropertyManager, under Fillet Type, select Face fillet.
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Under Items To Fillet, set a Radius 
value.
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Select the first face to fillet in the graphics area for Face Set 1. The preview arrow indicates the direction of the face fillet.
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Click in Face Set 2, then select the second face to fillet in the graphics area. If necessary, click Reverse Face Normal
so the arrows point towards each other.
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Set the other PropertyManager options. Under Fillet Options, the Trim surfaces options apply only to face fillets using surfaces:
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Trim and attach. Trims the filleted faces and knits the surfaces into one surface body.
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Don't trim or attach. Adds a new fillet surface, but does not trim the faces or knit the surfaces.
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Click OK 
.
The face fillet with Trim and attach selected.
