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If I'm understanding you correctly, the Convert First Column to Notes script in the Useful Scripts package on the OmniOutliner Extras page at should do the trick. If you've only got one column in your document when you run it, you'll get an error message about NSUnknownKeyScriptError, but you can disregard it (normally the script deletes the first column to move all subsequent columns over to replace the data that went into the notes field). If you want the script to leave your first column intact, simply put "--" in front of the following lines:
set text of cell j of row i to ""

delete column columnCount