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I find the topic during meeting same problem, I check WF 4.0 help which just very simply descripe how to do it,but not any example.
During my trying, my detrail drawing section window's full(aligned) item is gray, and can NOT be choiced. struggle half days and found the reason. the unfold and aligned cross section can NOT work in Main projection drawing (first projection veiw), later view (projection view) can do it.
hope this can help other people like me.