Let’s say my game will have multiple maps…and I will change to one to another using the OPEN LEVEL node…and I have a INT variable “MyMoney” I want to pass to that maps to simulate how much money the player have…how much he spend over on each level…
To do all this I need to know if is possible passing variables…interfaces…custom events…that sort of things to one and other maps… is that possible and if is how I can do it?
Use an interface.
Create:
https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/Types/Interface/index.html
Read his quastion… ; p you guys getting really obsesed with those interfaces
They are really amazing! But I don’t think she will save my question… 
btw this might be what you looking for:
Mayb ther other way i dont know, look up on class viewer 
You could also try streamed levels which you have singl leve that strams other levels, there example in Contnt Exmaples
What is exactly this site you sent to me hummmm Game Instance…now I have a word to research…