Change a Bool in a BP which is in a Sub-level from the persistent level

well if i isolate 1 Sublvl and add the references PodBP to its LevelBP it works. BUT this will mean i will have to trigger the trigger inside the sublevels somehow from the persistent lvl.
( I tried referencing them inside the Level_worldLevelBP and I get external package error and cannot save)

When i try to add references to PodBP to Level_worldLevelBP I can’t , im sure its because the BP’s are inside Level_1