ScreenTime, Schooltime, Apple Watch and Iphone

If my child has her own iPhone and Apple watch (luxury problems indeed), how do I set up Schooltime and Screentime on her watch? Her own iPhone is going to be the iPhone used to set up the watch so that if she gets a call it will ring on her watch. I want to be able to have the same control over the watch that I have over her phone with Screentime. I also want the same control Schooltime provides in being able to set up multiple blocks of time that the watch is blocked, whereas Screentime only allows one period of time.