Presenter - Introduction of Main and Sub List combined in 1 Service

Under Add New Screen, can have other Service Sub List, meaning there is a Main List and Sub List, this Sub list can output other screen without affecting the Main List Service. These feature can be seen in 1 service, contains 1 main and sub list.

We are trying to achieve, like in the Main List, LED Screen and a separate TV, the Sub List contains Welcome screen on other separate TV.