I mean these things. I wonder if there is a plugin that allows you to form a parent link from these green circles to other body parts. For example, I want glute to follow hand , to do this I need to form a parent link from the glute to the hand, but I don't know how because the glutes can't be selected.
Ok I see. You can't. these are not control node. You can't control joints, like links between controller nodes. Glute is just a morph shape joint, that use Hip and thigh to move.
You asking to move a person without his bones. If that make sense.
What you would do is select the hand control node (lHandControl), then choose the non-control node to link it to. I don't use parent links much. I prefer Physics links. There's no script to do this, it's just part of posing a character. When you save a pose preset, that relationship is saved. Be aware that having parent/physics links active as soon as animation starts can cause bad things to happen.
The glute following the hand can kind of be done by linking Empty objects rather than the body parts directly.
You make two Empty objects and align both to the glute. Set one Empty to physics link with the glute, set the other Empty to parent link to the hand. Add the AlignHelper plugin to the Empty linked to the glute and have it target the Empty linked to the hand with the "Lock" option enabled.
I'm not sure if this is what Abobba wanted though.