Sorry for the late reply, but it’s working ! I would have never thought of using a Map Variable in this case, thanks so much @Mind-Brain and @Everynone for your help 
It leads to another question on my side, since my values are now listed inside the MAP Variable, how could i do to tell Unreal to use these values instead of the multiplier in the Custom Event ?
For now, it’s working if my cube has at the start a O scale value assigned in the X axis and a 1 multiplier added to my Initial Cube X Scale Variable. But, I was wondering, if my cube doesn’t have a O scale value in the X axis, is there a node or something else to use first my Initial Cube X Scale variable and then my New Scale Parameter variable ?
