how do I target the content affected by an adjustment layer to a new one?

This seems very basic but I don't know the answer so here goes:  I created a Curves adjustment layer but did not make the content its own layer as I wanted to feather in the affected area, not have it created as a selection using the Quick Selection tool.  However, I now want to add a Hue/Saturation Layer to that same content.  Is there some way to do this without using the brush tool to affect the same area all over again?  The orange arrow is poitning to the shoulder area that I want to affect.  Thanks.