WordPress Template Hierarchy

Hi I have question about file names. If I have custom post type, and for template I can create for example single-portfolio.php and get content of portfolio posts into this file, but i need to get that post not in same file I want get it on individual files for example single-portfolio-post1.php something like this but second file that I create doesn’t work how can i do that?

Thank you

You can use the dynamic filter {type}_template (where {type} is the current query type e.g. single, index etc.) found in get_query_template():

function wpse_204848_get_id_template( $template ) {
    if ( $post = get_queried_object() ) {
        if ( $_template = locate_template( "single-{$post->post_type}-{$post->ID}.php" ) )
            $template = $_template; 
    }

    return $template;
}

add_filter( 'single_template', 'wpse_204848_get_id_template' );

For a portfolio post of ID 5, it will use the template single-portfolio-5.php if it exists.