With smart objects, you can apply the same edit across multiple screens at once.
Once you have set an element within your template to be a smart object, anytime you edit it, the same change will be applied anywhere the element is found throughout the template.
The smart objects menu is found in the template editor.
Create a smart object to your template and then apply it across all screens.
Screens where the smart object exists will have the icon displayed in the screen's thumbnail.
Unapply smart objects at anytime also through the template editor.