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If you want to add a SUPPORTING column, then you might want to hire that out. It is very doubtful that a partial wall is a supporting wall, and thus it might not line up with a joist inside the ceiling at all. Indeed, it might even run parallel with the joists right between two of them. You would need a stud detector to be sure to find where your joists are, which way they are running, and the like.
[This message has been edited by Lawrence (edited August 18, 2001).]