Ah I think I found how to achieve that, Check here :
https://docs.unrealengine.com/latest/INT/Engine/Sequencer/HowTo/TracksLevelVisibility/index.html
Ah I think I found how to achieve that, Check here :
https://docs.unrealengine.com/latest/INT/Engine/Sequencer/HowTo/TracksLevelVisibility/index.html