partner-contact/base_location/views/res_city_zip_view.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record model="ir.ui.view" id="city_zip_form">
        <field name="name">res.city.zip.form</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <form string="Zip">
                <group>
                    <field name="name" />
                    <field name="city_id" />
                </group>
            </form>
        </field>
    </record>
    <record model="ir.ui.view" id="city_zip_tree">
        <field name="name">res.city.zip.tree</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <tree string="Zips" editable="top">
                <field name="name" />
                <field name="city_id" />
            </tree>
        </field>
    </record>
    <record id="view_city_zip_filter" model="ir.ui.view">
        <field name="name">res.city.zip.select</field>
        <field name="model">res.city.zip</field>
        <field name="arch" type="xml">
            <search string="Search zip">
                <field name="name" />
                <field name="city_id" />
            </search>
        </field>
    </record>
    <record id="action_zip_tree" model="ir.actions.act_window">
        <field name="name">Locations</field>
        <field name="res_model">res.city.zip</field>
        <field name="view_mode">tree,form</field>
        <field ref="city_zip_tree" name="view_id" />
        <field name="search_view_id" ref="view_city_zip_filter" />
    </record>
    <menuitem
        name="Zips"
        id="locations_menu_zips"
        parent="contacts.menu_localisation"
        action="action_zip_tree"
        sequence="5"
    />
</odoo>