Hmmm.... on my way to work so I can't do it right now but there might be a way to do this. We know that the Position column doesn't contain anything that supports the required relationship calculations. However, sarwaanmca has laid out what the relationships are in a post further above. Perhaps the answer is to create a table with the postion name (from the position column), an "ID", a "ParentID", and a "Level" column to impart the necessary relationship information to the data.

The fly in the ointment, of course, will be the non-unique leaf levels.