Currently, a table in a Product Note can be copy/paste only entirely (from first cell to last). It is not possible to select only on colomn or one row. The copy doesn't work.
Thank you for your idea. We have just launched the Aha! collaborative text editor. Among other improvements, the copy and paste behavior with tables has been greatly improved. You should now be able to copy/paste (using keyboard shortcuts) any number of cells that you wish.