I'm not entirely sure why you'd rename a hash table that you created, but I suppose it's not a bad command to have. For the item names, it would just cut 2 commands down to 1 command, so I'm not sure why you'd do that.
As far as copying, that's not difficult to do without any other commands.
/hadd Table2 Item1_or_Item2 $hget(Table1,Item1).data
