magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/AdminCheckoutActionGroup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <!-- Checkout select Check/Money billing method -->
    <actionGroup name="AdminCheckoutSelectCheckMoneyOrderBillingMethodActionGroup">
        <annotations>
            <description>Selects the Billing Method "Check / Money order" on the Admin 'Create New Order for' page.</description>
        </annotations>

        <waitForPageLoad stepKey="waitForLoadingMask"/>
        <waitForPageLoad stepKey="waitForPageLoad"/>
        <conditionalClick selector="{{AdminCheckoutPaymentSection.checkBillingMethodByName('Check / Money order')}}" dependentSelector="{{AdminCheckoutPaymentSection.checkBillingMethodByName('Check / Money order')}}" visible="true" stepKey="selectCheckmoBillingMethod"/>
        <waitForPageLoad stepKey="waitForLoadingMaskAfterBillingMethodSelection"/>
    </actionGroup>
</actionGroups>