On my verizon T720, in the edit mode scroll down to the ...MORE... and
select it.  Then select Phone Number.

   I think this is what you are looking for:

   hit phonebook, hit the menu key, scroll to setup, press select,
highlight the view item with the scroll key, press change and highlight
primary with the scroll key. That sets up the phone book so you see one
entry for each name and you can use the scroll key to pick which type of
number you want to call for that person, c-phone, home phone, work phone,
etc.

   This is for T720i for CDMA, I assume the GSM internal phonebook works
the same.