magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/FillNewShippingAddressModalActionGroup.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">
    <actionGroup name="FillNewShippingAddressModalActionGroup" extends="FillShippingAddressOneStreetActionGroup">
        <annotations>
            <description>EXTENDS: FillShippingAddressOneStreetActionGroup. Selects the provided State in the 'Shipping Address' section of the Storefront Checkout page.</description>
        </annotations>
        <arguments>
            <argument name="address"/>
        </arguments>

        <selectOption stepKey="selectRegion" selector="{{CheckoutShippingSection.region}}" userInput="{{address.state}}" after="fillCityName"/>
    </actionGroup>
</actionGroups>