Here is the view code: It is working fine and showing to me

<record id="view_product_profitability_pivot" model="ir.ui.view">
        <field name="name">product.profitability.report.pivot</field>
        <field name="model">sale.order.line</field>
        <field name="arch" type="xml">
            <pivot string="Sales Analysis" disable_linking="True">
                <field name="oper_areaa"  type="col"/>
                <field name="product_brand_id"  type="row"/>
            </pivot>
        </field>
   </record>

I want to show operational area in + icon and when some one click on + icon it will show list of area in row format how can i do that please help me.