How to find FG Item from it's component Item?

Summary

How to find FG Item from it's component Item?

Content

Hi Team,

from a component item how to find what it's FG item? I tried using 'Where Used' in the component Item specifications. It was not working, what is the easiest way to find out the parent item from a component Item? Please suggest it is to be used for cost scenario creation purpose. Some costs require to be rolled up to the parent items as well we need an easy way for that as we know just a lot component items and need t know their parent items as well for roll up.