How do i access a blueprint from inside the level?

Hello everyone.

Let’s say i made a blueprint puzzle, which contains some geometry inside as well as a specialized camera to switch to when the puzzle is accessed. Then i placed it inside a level. The game is in TPP, i know i can assign a button to access the blue print from the level, but… how exactly do i do that. I can add an on event button action inside the level blueprint, but how do i prompt it to execute the puzzle blueprint and switch the main camera to the puzzle blueprint camera.

Would appreciate anything regarding this. Thanks everyone.