"from Persisten Level" blueprint node

Hi all,

I just started with UE and I can’t find one thing in the docs.
What are these nodes marked as “from Persistent Level”, like the Camera Actor on this screen

How these are added to blueprint?

Those are references to objects in your level. If you select an Actor in the Editor Viewport or the Scene Outliner then when you right click in the Level Blueprint graph you will see the option to add a reference to that Actor or add events for that Actor.

Thanks. I was looking for it on almost every type of blueprint but not on the level blueprint.

how can i do the same but in c++?