We found a response to your question!

Courtesy of: Autodesk Inventor Groups at http://discussion.autodesk.com/
responded to by: Kent Keller

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Assembly features aren't currently able to be pushed down the the part
level. Assembly features are generally used for machining type of
operations on weldments.

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Kent Keller
Autodesk Discussion Group Facilitator
http://discussion.autodesk.com/

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