Change page layout in bulk

Hi there,

thats a lot of content :) Are these pages or posts ? As you would need some way of differentiating the content from existing such as a Taxonomy.

Hi David. Indeed a lot of content (hotels).

Those are pages.

And i assume the existing content are also Pages ?
First thing that comes to mind is to register a taxonomy for the pages you're going to import then use that for a Layout Elements Display Rules where you can remove the sidebar.
Ultimately we need something to differentiate the two that isn't going to change.

Yes. Existing content are also Pages.

How can i register a taxonomy for the pages that i am going to import?

Before doing any of this i suggest you test it out using backup/staging sites of both the current and export data site.

This PHP Snippet will register a custom taxonomy called Element Controls with a default term of Display Rules for your pages:

add_action( 'init', 'element_control_custom_tax' );
function element_control_custom_tax() {
    register_taxonomy(
        'element-controls',
        array( 'post', 'page' ),
        array(
            'label' => __( 'Element Controls' ),
            'rewrite' => array( 'slug' => 'element-controls' ),
			'hierarchical'      => true,
			'show_in_rest' => true,
        )
    );
    register_taxonomy_for_object_type( 'element-controls', 'page' );
    $parent_term = term_exists( 'element-controls', 'element-controls' ); // array is returned if taxonomy is given
	$parent_term_id = $parent_term['term_id']; // get numeric term id
	wp_insert_term(
		'Use Display Rules', // the term 
		'element-controls', // the taxonomy
		array(
			'description'=> 'Post will use the Display Rule Terms', 
			'slug' => 'display-rules', 
			'parent'=> $parent_term_id
		)
	);
}

You would need it on both sites ( the import to and export from ).
Then on the site you want to export from you can set the category for each of your pages.
I don't have a solution for pragmatically setting the term on all your export pages, so you would need to use Bulk Edit ( 999 pages at a time ) to include the term.

I believe in WP All Import you have the option to include Taxonomies / Custom Taxonomies.

May be worth doing a test of one or two pages to begin with.