Layered Blend Per Bone - Why can't I isolate hierarchies?

Development Character & Animation
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1

Using the UE4 Mannequin Skeleton. If I enter “Pelvis” it gives me everything, I want the Pelvis, Spine_01, Spine_02, Spine_03, Clavicle_R and all below. Except, I can’t. Because if I give it the Pelvis it takes everything, or if I give it any of the spines it takes both arms.

Can you please explain how I’m meant to isolate in this manner otherwise what is the point of the slot system beyond very basic means?

Some of my character’s attacks use one arm, others use two, both need to use the pelvis and spines. How do I set my slots up?

2

Figured it out. I add more Layered blend per nose using the initial cached pose to essentially mask out the parts I don’t want.