hero shot

Hello my first post here.
For each clip I want to select one hero shot representing best image. How do I do for keeping some memory of the frame selected? How can these hero frames stay the same in the neighbor clips window (color section)? thx
For each clip I want to select one hero shot representing best image. How do I do for keeping some memory of the frame selected? How can these hero frames stay the same in the neighbor clips window (color section)? thx