Multiple Custom Taxonomies https://wp.me/p1lTu0-h6P

functions.php

add_action( 'init', 'multiple_custom_taxonomies' );

function multiple_custom_taxonomies() {

    register_taxonomy( 'Planes', 'post',
 
    array(
        'label' => __( 'Planes' ),
    ) );
    
    register_taxonomy( 'Trains', 'post',
 
    array(
        'label' => __( 'Trains' ), 
    ) );
    
    register_taxonomy( 'Automobiles', 'post',
 
    array(
        'label' => __( 'Automobiles' ),
    ) );
    
}