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You are currently looking at documentation for Umbraco 8 and older versions.
Go to docs.umbraco.com/umbraco-cms/extending/section-trees/sections#create-a-custom-section for documentation for Umbraco 9 and newer versions.

    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