This can be accomplished with some custom filters & actions.
Try placing this code in your theme's functions.php file:
add_filter( 'post_link', 'custom_permalink', 10, 3 );
function custom_permalink( $permalink, $post, $leavename ) {
// Get the categories for the post
$category = get_the_category($post->ID);
if ( !empty($category) && $category[0]->cat_name == "News" ) {
$permalink = trailingslashit( home_url('/'. $post->post_name .'-'. $post->ID .'/' ) );
}
return $permalink;
}
add_action('generate_rewrite_rules', 'custom_rewrite_rules');
function custom_rewrite_rules( $wp_rewrite ) {
// This rule will will match the post id in %postname%-%post_id% struture
$new_rules['^([^/]*)-([0-9]+)/?'] = 'index.php?p=$matches[2]';
$wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
return $wp_rewrite;
}
This will set up the permalink structure that you want for posts: