Paste copied contents of a cell as a comment in another cell

Hi,
I am working on a database and trying to remove duplicates. When there are duplicates, I want to take the contents of one cell and copy them as a comment on the cell above (or below).
I tried to work on a small macro to do so, but the contents of the cell cannot be copied (it comes out as a blank).
The long way is to 'double click' in the cell, Ctrl+A, cut, click the cell above, Ctrl+F2, paste. This way is very long as I have thousands of duplicates.

Thank you,
Manjula