You cannot turn a Switch that uses the Group feature into a multifunction Switch (where a single Switch executes multiple features).
Even if you set a Switch on the Base Screen and a Switch on the Window Screen which it calls to the same Group Number, the two switches will not be handled as the same Group.
The Group Number for [Group] and [Group with Auto OFF] are handled as different entities.
When you set [Group with Auto OFF], the bit will automatically turn OFF when the screen changes. Even if it is placed on the window, the bit will be turned OFF when the window closes.