server-tools/excel_import_export_demo/report_action/sale_order/templates.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="sale_order_excel_template" model="xlsx.template">
        <field name="res_model">sale.order</field>
        <field name="fname">sale_order_form.xlsx</field>
        <field name="name">Sale Order Template</field>
        <field name="description">Sample Sales Order Template for testing</field>
        <field name="input_instruction">
            {
                '__EXPORT__': {
                    'sale_order': {
                        '_HEAD_': {
                            'B2': 'partner_id.display_name${value or ""}#{align=left;style=text}',
                            'B3': 'name${value or ""}#{align=left;style=text}',
                        },
                        'order_line': {
                            'A6': 'product_id.display_name${value or ""}#{style=text}',
                            'B6': 'name${value or ""}#{style=text}',
                            'C6': 'product_uom_qty${value or 0}#{style=number}',
                            'D6': 'product_uom.name${value or ""}#{style=text}',
                            'E6': 'price_unit${value or 0}#{style=number}',
                            'F6': 'tax_id${value and ",".join([x.display_name for x in value]) or ""}',
                            'G6': 'price_subtotal${value or 0}#{style=number}@{sum}',
                        }
                    }
                },
            }
        </field>
    </record>

    <function model="xlsx.template" name="load_xlsx_template">
        <value eval="[ref('sale_order_excel_template')]"/>
    </function>

</odoo>