magento-test/app/code/Magento/Sales/etc/sales.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Sales:etc/sales.xsd">
    <section name="order_invoice">
        <group name="totals">
            <item name="subtotal" instance="Magento\Sales\Model\Order\Invoice\Total\Subtotal" sort_order="50"/>
            <item name="discount" instance="Magento\Sales\Model\Order\Invoice\Total\Discount" sort_order="100"/>
            <item name="shipping" instance="Magento\Sales\Model\Order\Invoice\Total\Shipping" sort_order="150"/>
            <item name="tax" instance="Magento\Sales\Model\Order\Invoice\Total\Tax" sort_order="200"/>
            <item name="cost_total" instance="Magento\Sales\Model\Order\Invoice\Total\Cost" sort_order="250"/>
            <item name="grand_total" instance="Magento\Sales\Model\Order\Invoice\Total\Grand" sort_order="350"/>
        </group>
    </section>
    <section name="order_creditmemo">
        <group name="totals">
            <item name="subtotal" instance="Magento\Sales\Model\Order\Creditmemo\Total\Subtotal" sort_order="50"/>
            <item name="discount" instance="Magento\Sales\Model\Order\Creditmemo\Total\Discount" sort_order="150"/>
            <item name="shipping" instance="Magento\Sales\Model\Order\Creditmemo\Total\Shipping" sort_order="200"/>
            <item name="tax" instance="Magento\Sales\Model\Order\Creditmemo\Total\Tax" sort_order="250"/>
            <item name="cost_total" instance="Magento\Sales\Model\Order\Creditmemo\Total\Cost" sort_order="300"/>
            <item name="grand_total" instance="Magento\Sales\Model\Order\Creditmemo\Total\Grand" sort_order="400"/>
        </group>
    </section>
    <order>
        <available_product_type name="simple"/>
        <available_product_type name="virtual"/>
    </order>
</config>