I need to use a primary blendspace for walking and a secondary blendspace that works over the other one but only on the legs. Please help me figure this out.
it sounds like you are looking for something like a per bone blend. a per bone blend will allow you to have multiple different animations playing on the same character but affect different parts of the body. think one anim affecting the waist down and another everything above the waist.
then again you mention a walking anim then another that affects the legs so its not entirely clear.
honestly its been awhile since ive set it up so i couldnt say exactly what to do, but as i remember by default the blend should affect all bones below the one specified. so anything below your pelvis in the heirarchy should be affected. for this reason most tutorials specify the spine as the bone. since the legs are usually off the pelvis this creates the needed separation in heirarchy.
below is a link to a tutorial not sure how good it is but it seemed to cover the topic.
