WordPress most useful hooks(It was used for one project, I directly copy paste it. So use it as per your requirements.)

functions.php

<?php
/**
 * File contains all hooks related to Submission post type.
 *
 * Required in customizer.php.
 *
 * @package vk-research
 */

/**
 * Add RFPs column to submission list.
 *
 * @param array $columns List of columns.
 *
 * @return array List of columns.
 */
function vk_research_add_rfp_column( $columns ) {

	// Remove taxonomy column if available.
	if ( isset( $columns['taxonomy-rfp'] ) ) {
		unset( $columns['taxonomy-rfp'] );
	}

	// Add RFPs column.
	return array_merge( $columns, array(
		'rfp' => __( 'RFPs', 'vk-research' ),
	) );
}
add_filter( 'manage_submission_posts_columns', 'vk_research_add_rfp_column' );

/**
 * Add content to RFPs column.
 *
 * @param string $column  Name of the column.
 * @param int    $post_id ID of Post.
 */
function vk_research_add_rfp_column_content( $column, $post_id ) {

	if ( 'rfp' === $column ) {

		$parent_id = get_post( $post_id )->post_parent;
		$post_parent = get_post( $parent_id );

		printf(
			'<a href="%1$s" title="%2$s">%2$s</a>',
			esc_url( $post_parent->guid ),
			esc_html( $post_parent->post_title )
		);
	}
}
add_action( 'manage_submission_posts_custom_column', 'vk_research_add_rfp_column_content', 10, 2 );

/**
 * Make RFPs column sortable.
 *
 * @param array $columns List of columns.
 *
 * @return array List of columns.
 */
function vk_research_rfp_sortable_column( $columns ) {
	$columns['rfp'] = 'rfp';

	return $columns;
}

add_filter( 'manage_edit-submission_sortable_columns', 'vk_research_rfp_sortable_column' );

/**
 * Manage order by for RFPs column.
 *
 * @param string $query The query to display data.
 */
function vk_research_rfp_orderby( $query ) {
	if ( ! is_admin() ) {
		return;
	}

	$orderby = $query->get( 'orderby' );

	if ( 'rfp' === $orderby ) {

		$query->set( 'orderby', 'parent' );
	}
}

add_action( 'pre_get_posts', 'vk_research_rfp_orderby' );


/**
 * Add RFPs metabox for submission.
 */
function vk_research_submission_metabox() {
	add_meta_box( 'submission-rfps', 'RFPs', 'vk_research_submission_attributes_meta_box', 'submission', 'side', 'high' );
}
add_action( 'add_meta_boxes', 'vk_research_submission_metabox' );

/**
 * Manage RFPs metabox content.
 *
 * @param object $post Post object.
 */
function vk_research_submission_attributes_meta_box( $post ) {

	$post_type_object = get_post_type_object( $post->post_type );

	if ( $post_type_object->hierarchical ) {

		$rfps = wp_dropdown_pages( array(
			'post_type'        => 'rfp',
			'selected'         => esc_html( $post->post_parent ),
			'name'             => 'parent_id',
			'show_option_none' => esc_html__( 'Select RFPs', 'vk-research' ),
			'sort_column'      => 'post_title',
			'echo'             => 0,
		) );

		if ( ! empty( $rfps ) ) {

			$allowed_tags = array(
				'select' => array(
					'name' => array(),
					'id'   => array(),
				),
				'option' => array(
					'class'    => array(),
					'value'    => array(),
					'selected' => array(),
				),
			);

			echo wp_kses( $rfps, $allowed_tags );
		}
	}
}

/**
 * Add RFPs dropdown for filter.
 */
function vk_research_submission_rfp_filter() {

	$post_type = filter_input( INPUT_GET, 'post_type', FILTER_SANITIZE_STRING );

	$type = ( isset( $post_type ) ) ? $post_type : 'post';

	// Only add filter to post type you want.
	if ( 'submission' === $type ) {

		$selected_rfp = filter_input( INPUT_GET, 'vk_research_rfps', FILTER_VALIDATE_INT );

		$rfps = wp_dropdown_pages( array(
			'post_type'        => 'rfp',
			'selected'         => esc_html( $selected_rfp ),
			'name'             => 'vk_research_rfps',
			'show_option_none' => esc_html__( 'Select RFPs', 'vk-research' ),
			'sort_column'      => 'post_title',
			'echo'             => 0,
		) );

		if ( ! empty( $rfps ) ) {

			$allowed_tags = array(
				'select' => array(
					'name' => array(),
					'id'   => array(),
				),
				'option' => array(
					'class'    => array(),
					'value'    => array(),
					'selected' => array(),
				),
			);

			echo wp_kses( $rfps, $allowed_tags );
		}
	}
}
add_action( 'restrict_manage_posts', 'vk_research_submission_rfp_filter' );

/**
 * Setup filter by post_parent.
 *
 * @param string $query The query to display data.
 */
function vk_research_rfp_filter( $query ) {

	global $pagenow;

	$post_type = filter_input( INPUT_GET, 'post_type', FILTER_SANITIZE_STRING );

	$type = ( isset( $post_type ) ) ? $post_type : 'post';

	$selected_rfp = filter_input( INPUT_GET, 'vk_research_rfps', FILTER_VALIDATE_INT );

	if ( 'submission' === $type && is_admin() && 'edit.php' === $pagenow && isset( $selected_rfp ) && ! empty( $selected_rfp ) ) {

		$query->query_vars['post_parent'] = $selected_rfp;
	}
}
add_filter( 'pre_get_posts', 'vk_research_rfp_filter' );