Attaching heknet

I want to attach my helmet to the head and to the torso. I want to click a button and then I want the helmet to swtich from position. So first it’s on the head and after it’s on the waist (picture below). Anyone have an idea how to do this?

image

how did you attach the helmet to the waist? i could try writing something

It’s basically just an other helmet but just invisable.