Blend part faces
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Choose Home tab→Solids group→Blend
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On the Blend command bar, choose Blend.
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Use the Blend command bar boxes to define characteristics of the blends.
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Select the faces you want to blend.

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In the Radius box of the Select Step of the Blend command bar, type in a radius value, and then click the Accept button
 on the command bar.
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On the Blend command bar, click Finish.

 
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