Use Blendspace only on lowerbody

I have blendspaces for walking, walking uphill, walking downhill. I have my slope transitions all fixed up but I can’t figure out how to apply the uphill/downhill blendspaces only on the lower body of the character. At this time when I use these blenspaces it also changes the upper body with it. Is there a way to make it only affect lower body on these transitions?

Hello. we are looking for the same thing. for now I have solved with two line traces pointing towards the ground, one in front and one behind the charactet, and they measure the height of the ground with respect to the character (active one or the other according to the direction forward or backward). I know it’s not very professional but it works. we hope someone enlightens us