This is how I achieved following URL pattern while using the custom post type and custom taxonomy associated with it. - CPT Archive - xyz.com/classifieds - Custom Taxonomy - xyz.com/classifieds/automobiles - Single Post - xyz.com/classifieds/automobiles/Sell-My-Benz

local-plugin-cpt.php

<?php

/****Creating Custom Post Types of Classifieds Starts****/
 
function my_custom_post_classifieds() {
  $labels = array(
  	'name'               => _x( 'Classifieds', 'post type general name' ),
		'singular_name'      => _x( 'Classified', 'post type singular name' ),
		'add_new'            => _x( 'Add New', 'book' ),
		'add_new_item'       => __( 'Add New Classified' ),
		'edit_item'          => __( 'Edit Classified' ),
		'new_item'           => __( 'New Classified' ),
		'all_items'          => __( 'All Classified' ),
		'view_item'          => __( 'View Classifieds' ),
		'search_items'       => __( 'Search Classifieds' ),
		'not_found'          => __( 'No Classifieds found' ),
		'not_found_in_trash' => __( 'No Classifieds found in the Trash' ), 
		'parent_item_colon'  => '',
		'menu_name'          => 'Classifieds'
	);
	$args = array(
		'labels'        => $labels,
		'description'   => 'Holds all Classifieds kind of News',
		'public'        => true,
		'menu_position' => 5,
		'supports'      => array( 'title', 'editor', 'thumbnail', 'excerpt', 'comments' ),
		'has_archive'   => 'classifieds',
		'rewrite' => array( 'slug' => 'classifieds/%classified_category%', 'with_front' => false ),
	);
	register_post_type( 'classifieds', $args );	
	flush_rewrite_rules();
}
add_action( 'init', 'my_custom_post_classifieds' );
 
/****Creating Custom Post Types of Classifieds Ends****/
 
/****Creating Custom Taxonomies for Classifieds *****/
 
function my_taxonomies_classified_category() {
	$labels = array(
		'name'              => _x( 'Classified Categories', 'taxonomy general name' ),
		'singular_name'     => _x( 'Classified Category', 'taxonomy singular name' ),
		'search_items'      => __( 'Search Classified Categories' ),
		'all_items'         => __( 'All Classified Categories' ),
		'parent_item'       => __( 'Parent Classified Category' ),
		'parent_item_colon' => __( 'Parent Classified Category:' ),
		'edit_item'         => __( 'Edit Classified Category' ), 
		'update_item'       => __( 'Update Classified Category' ),
		'add_new_item'      => __( 'Add New Classified Category' ),
		'new_item_name'     => __( 'New Classified Category' ),
		'menu_name'         => __( 'Classified Categories' ),
	);
	$args = array(
		'labels' => $labels,
		'hierarchical' => true,
		'rewrite' => array( 'slug' => 'classifieds', 'with_front' => false ),	
	);
	register_taxonomy( 'classified_category', 'classifieds', $args );
}
add_action( 'init', 'my_taxonomies_classified_category', 0 );
 
 
/************************************************/
  
add_filter('post_type_link', 'classifieds_permalink_structure', 10, 4);
function classifieds_permalink_structure($post_link, $post, $leavename, $sample)
{
    if ( false !== strpos( $post_link, '%classified_category%' ) ) 
	{
        	$classified_type_term = get_the_terms( $post->ID, 'classified_category' );
	
		if(is_array($classified_type_term) && !empty($classified_type_term))
		{
        		$post_link = str_replace( '%classified_category%', array_pop( $classified_type_term )->slug, $post_link );
		}
    	}
    return $post_link;
}
 
/************************************************/