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You are currently looking at documentation for Umbraco 8 and older versions.
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    Creating custom sections in the backoffice

    The Umbraco backoffice consists of Sections, also referred to as Applications.

    While in previous versions this was done with a file applications.config, this file does not exists anymore.

    You can create a custom section by registering it using a package.manifest in an App_Plugins folder.Create a Custom Section