Custom Post Type Example

custom-post-type-features.php

function my_custom_post_types() {
	$args = array( 
		'label'                 => 'Recipes',
		'hierarchical'		=> true,
		'taxonomies		=> array( 'post_tag' )
	);
	register_post_type( 'recipe', $args );
}
add_action( 'init', 'my_custom_post_types' );

custom-post-type-full.php

add_action( 'init', 'my_recipes' );
add_filter( 'post_updated_messages', 'my_recipes_messages' );
add_action( 'admin_head', 'my_recipes_help' );

function my_recipes() {
	$labels = array(
		'name'               => 'Recipes',
		'singular_name'      => 'Recipe',
		'menu_name'          => 'Recipes',
		'name_admin_bar'     => 'Recipe',
		'add_new'            => 'Add New',
		'add_new_item'       => 'Add New Recipe',
		'new_item'           => 'New Recipe',
		'edit_item'          => 'Edit Recipe',
		'view_item'          => 'View Recipe',
		'all_items'          => 'All Recipes',
		'search_items'       => 'Search Recipes',
		'parent_item_colon'  => 'Parent Recipes:',
		'not_found'          => 'No recipes found.',
		'not_found_in_trash' => 'No recipes found in Trash.'
	);

	$args = array( 
		'labels'		=> $labels,
		'public'		=> true,
		'rewrite'		=> array( 'slug' => 'recipe' ),
		'has_archive'   => true,
		'menu_position' => 20,
		'menu_icon'     => 'dashicons-carrot',
		'taxonomies'		=> array( 'post_tag', 'category' ),
		'supports'      => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'custom-fields', 'comments' )
	);
	register_post_type( 'my_recipe', $args );
}

function my_recipes_messages( $messages ) {
	$post = get_post();

	$messages['recipe'] = array(
		0  => '',
		1  => 'Recipe updated.',
		2  => 'Custom field updated.',
		3  => 'Custom field deleted.',
		4  => 'Recipe updated.',
		5  => isset( $_GET['revision'] ) ? sprintf( 'Recipe restored to revision from %s',wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
		6  => 'Recipe published.',
		7  => 'Recipe saved.',
		8  => 'Recipe submitted.',
		9  => sprintf(
			'Recipe scheduled for: <strong>%1$s</strong>.',
			date_i18n( 'M j, Y @ G:i', strtotime( $post->post_date ) )
		),
		10 => 'Recipe draft updated.'
	);

	return $messages;
}

function my_recipes_help() {

	$screen = get_current_screen();

	if ( 'recipe' != $screen->post_type ) {
		return;
	}

	$basics = array(
		'id'      => 'recipe_basics',
		'title'   => 'Recipe Basics',
		'content' => 'Content for help tab here'
	);

	$formatting = array(
		'id'      => 'recipe_formatting',
		'title'   => 'Recipe Formatting',
		'content' => 'Content for help tab here'
	);

	$screen->add_help_tab( $basics );
	$screen->add_help_tab( $formatting );

}

custom-post-type-help.php

add_action( 'admin_head', 'my_custom_post_type_help' );

function my_custom_post_type_help() {

	$screen = get_current_screen();

	if ( 'recipe' != $screen->post_type ) {
		return;
	}

	$basics = array(
		'id'      => 'recipe_basics',
		'title'   => 'Recipe Basics',
		'content' => 'Content for help tab here'
	);

	$formatting = array(
		'id'      => 'recipe_formatting',
		'title'   => 'Recipe Formatting',
		'content' => 'Content for help tab here'
	);

	$screen->add_help_tab( $basics );
	$screen->add_help_tab( $formatting );

}

custom-post-type-labels.php

function my_custom_post_types() {
	$labels = array(
		'name'               => 'Recipes',
		'singular_name'      => 'Recipe',
		'menu_name'          => 'Recipe',
		'name_admin_bar'     => 'Recipe',
		'add_new'            => 'Add New',
		'add_new_item'       => 'Add New Recipe',
		'new_item'           => 'New Recipe',
		'edit_item'          => 'Edit Recipe',
		'view_item'          => 'View Recipe',
		'all_items'          => 'All Recipes',
		'search_items'       => 'Search Recipes',
		'parent_item_colon'  => 'Parent Recipes:',
		'not_found'          => 'No recipes found.',
		'not_found_in_trash' => 'No recipes found in Trash.'
	);

	$args = array( 
		'public'      => true, 
		'labels'      => $labels,
		'description' => 'My yummy recipes will be published using this post type'
	);
    	register_post_type( 'recipe', $args );
}
add_action( 'init', 'my_custom_post_types' );

custom-post-type-menus.php

function my_custom_post_types() {
	$args = array( 
		'menu_position' => 20,
		'menu_icon'     => 'dashicons-carrot'
	);
    	
    	register_post_type( 'recipe', $args );
}
add_action( 'init', 'my_custom_post_types' );

custom-post-type-messages.php

add_filter( 'post_updated_messages', 'my_custom_post_type_messages' );
function my_custom_post_type_messages( $messages ) {
	$post = get_post();

	$messages['recipe'] = array(
		0  => ''
		1  => 'Recipe updated.'
		2  => 'Custom field updated.'
		3  => 'Custom field deleted.'
		4  => 'Recipe updated.'
		5  => isset( $_GET['revision'] ) ? sprintf( 'Recipe restored to revision from %s',wp_post_revision_title( (int) $_GET['revision'], false ) ) : false,
		6  => 'Recipe published.'
		7  => 'Recipe saved.'
		8  => 'Recipe submitted.'
		9  => sprintf(
			'Recipe scheduled for: <strong>%1$s</strong>.',
			date_i18n( 'M j, Y @ G:i', strtotime( $post->post_date ) )
		),
		10 => 'Recipe draft updated.'
	);

	return $messages;
}

custom-post-type-rewrite.php

function my_custom_post_types() {
	$args = array( 
		'label'       => 'Product',
		'rewrite'     => array( 'slug' => 'product' )
	);
	register_post_type( 'my_product', $args );
}
add_action( 'init', 'my_custom_post_types' );

custom-post-type-simple.php

function my_custom_post_types() {
	register_post_type( 'recipe', array( 'public' => true, 'label' => 'Recipes' ) );
}
add_action( 'init', 'my_custom_post_types' );

custom-post-type-visibility.php

function my_custom_post_types() {
	$args = array( 
		'label'                 => 'Customer Notes',
		'public'                => false,
		'show_ui'	        => true,
		'show_in_admin_bar'     => true
	);
	register_post_type( 'customer_note', $args );
}
add_action( 'init', 'my_custom_post_types' );

thanks

i create a menu

Travel
==== All travel
==== New Travel
==== Tag
==== category

but how can Add

sub menu Calender and reservation