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How to override checkout_index_index.xml

this is the file present in my app/design dir. i need to disply shipping address section on right side bar and move the product overview section from right side bar to the place of currenct shipping address section. i am beginner can somebody please guide me how to do that?

    <?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column"
      xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceContainer name="header.panel" remove="false"/>
        <referenceBlock name="catalog.topnav" remove="false"/>
        <item name="postcode" xsi:type="array">
            <item name="sortOrder" xsi:type="string">75</item>
            <!-- post-code field has custom UI component -->
            <item name="component" xsi:type="string">Magento_Ui/js/form/element/post-code</item>
            <item name="validation" xsi:type="array">
                <item name="required-entry" xsi:type="string">true</item>
                <item name="validate-zip-us" xsi:type="string">true</item>
            </item>
        </item>
    </body>
</page>