BONE RIGGING to different BONE in the structure

Trying to RIG character with BONE DEFORMATION. The main structure is the TORSO which is rigged from BOTTOM UP (so pivot is in the butt area). See attached jpg. When I nest my Kinetic Output Arms, they move with the UPPER BODY like I want, but the LEGS also move with the shoulders. Used to be, you’d drag the KO LEGS (or whatever) to the specific bone, but now with HARMONY 20, when I do this, the LEGS disappear altogether. Very good chance I’m misremembering how to do this, but I’ve had zero luck finding documentation on how to choose which section of a BONE STRUCTURE to attach limbs to (outside of the default way). Any help would be appreciated.