Create a master document
The master document contains all style settings, such as paragraph styles, character styles, page sizes, color definitions, and margins. Every document item in your project needs to have a master document assigned to it. A default master document is assigned to every new document unless another one has been specified.
To create a new master document in InDesign:
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In the Libraries panel, in the Master documents section, click the folder in which you want to create the new master document.
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Create a new InDesign document or open an existing document.
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Click Add an item.
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In the New master dialog box, enter the name of the new master and click OK. The InDesign document is now uploaded to the server and stored as a new master document in the libraries.
Avoid working with different InDesign versions. For example, once you save a master in CS6, you cannot open it in CS5.5.