Giving a specific spell progression to a custom kit, similar to the Dragon Disciple ?

Heya,

In BG:EE, a new 2DA file, MXSPLDD.2DA defines the spell progression that is used by Dragon Disciple.
If I were to create a new kit, how would I define a new MXSPLMYKIT.2DA file for them ?

I can't find the corresponding reference in any other 2DA file :D