The Replacement Variable Manager lists all of your styles, together with any replacement variables defined within them. This allows you to see at a glance the way in which any replacement variables you have defined are being inherited by child styles.
To learn more about Replacement Variables, please read the Replacement Variables Introduction
<<<screenshot of Replacement Variable Manager>>>
Refer to the Color Key at the top of the Replacement Variable Manager page to see how colors are used to indicate whether a replacement variable is customized in a particular style, or inherited from a parent style.