Odoo-Tutorial/library/views/library_menus.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <menuitem
        id="menu_library"
        name="Library"
        sequence="10" />

    <menuitem
        id="menu_library_book"
        name="Books"
        action="menu_library_books"
        parent="menu_library"
        sequence="10" />

    <menuitem
        id="menu_library_member"
        name="Members"
        action="action_library_members"
        parent="menu_library"
        sequence="10" />
</odoo>