vracoop_pack_custo/report/sale_report.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="vracoop_report_saleorder_document" inherit_id="sale.report_saleorder_document">
        <xpath expr="//tbody[@class='sale_tbody']" position="replace">
            <tbody class="sale_tbody">

                <t t-set="current_subtotal" t-value="0"/>

                <t t-foreach="doc.order_line" t-as="line">
                    <t t-if="not line.pack_parent_line_id">
                        <t t-set="current_subtotal" t-value="current_subtotal + line.price_subtotal" groups="account.group_show_line_subtotals_tax_excluded"/>
                        <t t-set="current_subtotal" t-value="current_subtotal + line.price_total" groups="account.group_show_line_subtotals_tax_included"/>

                        <tr t-att-class="'bg-200 font-weight-bold o_line_section' if line.display_type == 'line_section' else 'font-italic o_line_note' if line.display_type == 'line_note' else ''">
                            <t t-if="not line.display_type">
                                <td><span t-field="line.name"/></td>
                                <td class="text-right">
                                    <span t-field="line.product_uom_qty"/>
                                    <span t-field="line.product_uom" groups="uom.group_uom"/>
                                </td>
                                <td class="text-right">
                                    <span t-field="line.price_unit"/>
                                </td>
                                <td t-if="display_discount" class="text-right" groups="sale.group_discount_per_so_line">
                                    <span t-field="line.discount"/>
                                </td>
                                <td class="text-right">
                                    <span t-esc="', '.join(map(lambda x: (x.description or x.name), line.tax_id))"/>
                                </td>
                                <td class="text-right o_price_total">
                                    <span t-field="line.price_subtotal" groups="account.group_show_line_subtotals_tax_excluded"/>
                                    <span t-field="line.price_total" groups="account.group_show_line_subtotals_tax_included"/>
                                </td>
                            </t>
                            <t t-if="line.display_type == 'line_section'">
                                <td t-att-colspan="colspan">
                                    <span t-field="line.name"/>
                                </td>
                                <t t-set="current_section" t-value="line"/>
                                <t t-set="current_subtotal" t-value="0"/>
                            </t>
                            <t t-if="line.display_type == 'line_note'">
                                <td t-att-colspan="colspan">
                                    <span t-field="line.name"/>
                                </td>
                            </t>
                        </tr>

                        <t t-if="current_section and (line_last or doc.order_line[line_index+1].display_type == 'line_section')">
                            <tr class="is-subtotal text-right">
                                <td t-att-colspan="colspan">
                                    <strong class="mr16">Sous-total</strong>
                                    <span
                                        t-esc="current_subtotal"
                                        t-options='{"widget": "monetary", "display_currency": doc.pricelist_id.currency_id}'
                                    />
                                </td>
                            </tr>
                        </t>
                    </t>
                </t>
            </tbody>
        </xpath>
    </template>

</odoo>