In Unreal Engine 5.5, animation layers allow animators to work in a nondestructive way by separating different animation data into layers. This system is useful for blending, overriding, or adding motions to animations without altering the base animation directly. In this tutorial, we look at everything you need to know about Animation Layers
https://dev.epicgames.com/community/learning/tutorials/437q/animation-layers-in-unreal-engine-5-5