Custom Spell List on Monsters

[Fenris447]

I'm working on adding in the gnolls from the Ultimate Bestiary: Revenge of the Horde for my own use. The three caster gnolls all say they cast Druid spells, but they actually have spells from multiple classes' spell lists.

When building the monsters in the editors, I can of course select Druid for the spell list. Then as I build the .por/.stock file, I can only select the Druid spells. This is working as intended, but I also need to be able to select spells from other lists.

How do? The adjustment to add other classes' spells doesn't appear to work for a "race"'s spell list.