Not sure if this works or not, but try placing the rings and then going to your tool bar. Find the drop down that has "Change Object Parent" or something like that (Sorry, I don't have Poser open right now and forget which menu it's under).  Then change the parent to "L Collar" for the left ring and "R Collar" for the  right ring.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi