Pages « WordPress Codex

To create a subpage

    Go to Administration > Pages > Add New panel.
    In the right menu, click the “Page Parent” drop-down menu. The drop-down menu contains a list of all the Pages already created for your site.
    Select the appropriate parent Page from the drop-down menu to make the current Page a child Page.
    Add content to the subpage.
    Click Publish when ready

https://codex.wordpress.org/Pages

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