A master object is used when you want to display the same object on several sheets. You create and use master objects to apply global changes to your visualizations, dimensions, and measures. To create a Master object you add an object into the library as a Master object. You can use, for example, a master dimension in as many of your visualizations as you like and maintain it in just one place. Any updates you make to the master object will be applied everywhere the master object is used because they are linked together.