Animating different parts of a mesh

I have an issue where I have a character, and the character has several arm animations and several leg animations. I want to make the work load on my animators as low as possible, so I wanted to see if they could give me 3 arm animations and 3 leg animations separately instead of having to to give me 9 animations with all the combinations. The problem is that the character is all one mesh and I don’t know how to they should give me the bones to just the arms and the bones for just the legs in such a way that unity will be able to separate the animations for that single mesh.

I’d hate to have them separate the mesh into 2 parts (arms and legs) because there are also animations that both arms and legs.

Does anyone know if this is possible? Thanks!
Leo

Check out this;

Documentation’s a little foggy but you can set animations to blend on top of existing animations and only affect certain branches of the skeleton’s hierarchy.

perfect! Thanks!