I have a schedule defined with two layers, each a week in length. Each of the layers defines a 12 hour shift, one for US based people and the other for India based people. For the US based layer I want to create an override for the entire week that just replaces the US based person and not the India one. In other words, a different person will take the US shift for the entire week, but the India person will remain unchanged. How do I do this without having to schedule an override for each 12 hour shift of the US person?