How to edit TTS voice files to pronounce correctly?

I'm using TTS Susan v1.84.69 with Primo2 and NT 2012 Q3 NA maps. But I find that it doesn't pronounce some of the words correctly since they have been abbreviated in the new map. Some of the examples are:

Place: Pronounced as Plus - map shows as Pl
ExpressWay: Pronounced as Expwy - map shows as Expwy
Woodbine: Pronounced as Woodbin

How do I edit the voice file to include these pronunciations?

Thanks!

You might want to check my Loquendo tutorial in the Tomtom tutorial section.
I simply assume the handling of the dicionaries will be the same on both systems.