Lexus: Bluetooth phone in LS430

Does anyone know if there's a way to enter "one touch dial" information
manually? The only way I can get data into the car is by transmitting it
from my phone. The problem with this is that I can't modify the name that
appears on the one touch screen once it's been transmitted, and what's there
is not always descriptive enough. (For example, if I've got a cell number
and home number for the same person, I can't get two different labels
displayed on the car screen.) I've searched the menus live on the car,
searched the manuals that came with the car, searched the internet, and have
come up dry. I haven't been to the dealer yet (car's only got 3500 miles),
but they'll be the next stop.

Any ideas would be appreciated.

Carl