It’s pretty simple- you make an animation for each ball shooting off and then set up the main menu to jump to the appropriate animation once the selection is made.
So- you have the main version of the menu with the balls sitting still that loops. Then 4 seperate tracks- one for each ball movement and you jump to the appropriate one when the selection is made. In effect it’s a jump cut edit but since the balls are in the same spot in the moving menu no one will notice this.
Noah