Select Song and Songparts via PC an CC messages from Ableton

Hello,
could anybody help with this issue to get a basic GPScript with which I can select certain songs with PC massages and certain songparts with CC messages? The CC messages should be always the same like Intro CC20 Verse CC21 Chorus CC22.
Thank in advance
Thomas

Why do you need GP Script to do this?
Just define a program change for each song (technically the first song part of each song) and then assign CC messages to the individual song parts

Ah, now I understand this system. Great, much easier than I thought. Thank you very much therefore. Is the use of OSC as easy possible without scripting?