How does MetaHuman create animation blueprints?

I made an animation blueprint for Metahuman’s body. The steps are to redirect all the animations of the third-person template to Metahuman, and then make an animation blueprint for the body that completely imitates the third-person template. Now the problem is that only the body is moving, and the head is suspended in the air.
Can anyone teach me how to make a complete animation blueprint, that is, a complete animation blueprint for the body and head together? Thank you!