Thank you Adeptus for your answer.
If I understand, i must use Matinee? If I use Matinee, I must use a Level BP and not a Class BP?
Imagine, my lever opens/closes a door (so 2 animations, one for the lever and an other for the door).
Imagine now, my level contains a lot of lever-door couples. I can not create a Class BP with the lever and the door that I can reuse in my level but I must create a Level BP and a Matinee for each Lever-Door in the level?