If you have an item that's a transfer and has already been downloaded
into both accounts, if you change one side into a transfer, you should
be able to click "Show Matching" and then Command-Option-R to review
duplicates and merge the two in the other account.
Let me know if this doesn't work for you.
Peace,
Kevin Hoctor
ke...@nothirst.com
No Thirst Software LLC
http://nothirst.com
http://kevinhoctor.blogspot.com