server-tools/base_custom_info/views/menu.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2016 Jairo Llopis <jairo.llopis@tecnativa.com>
     Copyright 2017 Pedro M. Baeza <pedro.baeza@tecnativa.com>
     License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl). -->
<odoo>

    <!--Base menus -->
    <menuitem id="menu_base_custom_info"
              name="Custom Info"
              groups="base_custom_info.group_basic"
              web_icon="base_custom_info,static/description/icon.png"
    />

    <menuitem
        id="menu_basic"
        name="Basic"
        parent="menu_base_custom_info"/>

    <menuitem
        id="menu_advanced"
        name="Advanced"
        groups="base_custom_info.group_basic"
        parent="menu_base_custom_info"/>

    <menuitem id="menu_base_custom_info_template"
              action="custom_info_template_action"
              parent="menu_basic" sequence="10"/>

    <menuitem id="menu_base_custom_info_value"
              action="custom_info_value_action"
              parent="menu_basic" sequence="20"/>

    <menuitem id="menu_category"
              action="custom_info_category_action"
              parent="menu_advanced" sequence="10"/>

    <menuitem id="menu_property"
              action="custom_info_property_action"
              parent="menu_advanced" sequence="20"/>

    <menuitem id="menu_option"
              action="custom_info_option_action"
              parent="menu_advanced" sequence="30"/>

</odoo>