The device will see them all since BES will sync subfolders.
Maybe moving it to a separate folder in the root of the mailbox will help.
I would do the contact managment on the mail client instead of the device if possible.
There are a few duplicate contacts programs on the net you can try that might help
__________________ irony : many old timer posters have de-evolved into the trolls they once fought I am on http://supportforums.blackberry.com BES 10 running sweet for my Z10 and Q10