Unless someone can provide some kind of coding to insert this is probably going to be your best bet: http://www.processtext.com/abcblackberryipdeditor.html
Download to your download file then run the .exe file
Back up your contacts.
Open that file (.ibd file) with the ABC Amber Blackberry Editor.
You will have to manually edit each contact but this program makes it much easier than any other process I have run across.
When I merged all my address books I had to do the same thing. I was able to fix several hundred address files within an hour. It really is a very functional and small program.