In order to create multiple instances of a game object with the same components and properties, or access the same game object from different scenes, you can save it as a file in your
Assets folder. These files are called prefabs in Unity and act like game object templates. To create an empty prefab, right-click on the empty space in the Project panel, then select Create | Prefab from the contextual menu. A new file called
New Prefab should appear in the Project panel. Call this prefab
Wall. Now create an empty folder called
Prefabs and put the
Wall prefab in this folder.
Right now the prefab is empty.