practice/employee/views/menu.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <!--一级菜单-->
        <menuitem
                id="menu_employee_root"
                name="员工"
                web_icon="hr,static/description/icon.png"
                sequence="1"/>
        <!--二级菜单 -->
        <menuitem
                id="menu_employee_info"
                name="员工信息"
                parent="menu_employee_root"
                sequence="1"/>
        <!--三级菜单 -->
        <menuitem
                id="menu_view_ml_employee_tree"
                name="员工档案"
                action="view_ml_employee_action"
                parent="menu_employee_info"
                sequence="1"/>
    </data>
</odoo>