<data priority="50">

    <xpath expr="//table[@id='main_table']/thead/tr/th[4]" position="after">
        <t t-if="o.state_blanket_order != 'draft'">
            <th id="price_subtotal" class="text-right">
                <strong>Price Subtotal</strong>
            </th>
        </t>
    </xpath>

    <xpath expr="//table[@id='main_table']/tbody/tr/td[5]" position="after">

        <t t-if="o.state_blanket_order != 'draft'">
            <td id="price_subtotal" class="text-right">
                <span t-field="line_ids.price_subtotal"/>
            </td>
        </t>
    </xpath>

</data>