It’s not well documented, but I think what you’re looking [FONT=Courier New]FSkeletalMeshMerge
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/FSkeletalMeshMerge/index.html
Alternatively, there’s also SetMasterPoseComponent that allows you to have one master skeletal mesh (perhaps a character’s body), and additional “slave” skeletal meshes that will follow the pose and animation of the master pose component.