Is there a way to add animation for just one part of body ?

I have 3D character. I added “walk” animation to it and as you know this animation effects all part of body. But I don’t want animation effect upper body. Because I want character hands to stay the way I want(I made character upperbody look silly when it walks.).

I tried to change character upper body in animation tab manually but I couldn’t. Its really hard to change all joints manually.

So, Is there a way to add animation for just one part of body ?

You can set up different layer masks in mechanim to have the animation only effect the bones in the mask.