Combine parts of different motions?

[Full_Metal_Ted]

Hello,
I’m trying to find a workflow for combining (for example) the upper body of motion A with the lower body of motion B. I know there’s the Pose Manager, but that seems to only work with static poses, not motions.
I found this tutorial on YouTube. It seems to work in a hacky workaround way. I was hoping there was a more official Reallusion method or tool I was missing.

LIAC iClone Tutorial: Combining Portions of Different Animations

Thanks!!!
-TED-