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Scratch that! I have the answer for you!

Go to OmniOutliner Extras page and download Useful Scripts. Once you have that, install script Convert First Column to Notes which…

Quote:
moves the contents of the first column for each row into the notes pane, and moves the contents of subsequent columns up one column. (Contents of second column get moved to first column, etc.) It's primarily useful when you've imported information from another application.
Viola!