Global Variables - Where are stored?

Hi, I’m using Blueprint_Communication Map
https://docs.unrealengine.com/en-US/…nts/index.html
Insider the BP_Actors there are global variables stored with references to other BP_Actors in the scene.
I can’t find when those variables were stored.
They are not stored in the Level Blueprint or the GameInstance.
Can anyone help me?
Thanks.