in unity mecanim if you blend two or more animations you can set masks to each animation so they influence only the arms or the head or any bone you choose.
its possible to do something like that on unreal?
sorry for the noob question =)
I found one solution:
inside an animation blueprint>AnimGraph, you can use the “Layered Blend per bone” node
you can right click it and add layers by typing the name of the parent bone and set how deep your influence will be