partner-contact/base_location_nuts/views/res_country_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2015 Antiun Ingeniería S.L. - Jairo Llopis
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->

<openerp>
<data>

<record id="view_country_form" model="ir.ui.view">
    <field name="name">NUTS fields</field>
    <field name="model">res.country</field>
    <field name="inherit_id" ref="base.view_country_form"/>
    <field name="arch" type="xml">
        <xpath expr="/form">
            <group name="nuts" string="NUTS">
                <group>
                    <field name="state_label"/>
                    <field name="state_level"/>
                </group>
                <group>
                    <field name="substate_label"/>
                    <field name="substate_level"/>
                </group>
                <group>
                    <field name="region_label"/>
                    <field name="region_level"/>
                </group>
            </group>
        </xpath>
    </field>
</record>

</data>
</openerp>