[Plugin: WP No Category Base] Remove parent dir

Hi
How can I remove parent dir?
myblog.com/parent_dir/sub_dir/ –> myblog.com/sub_dir/
myblog.com/parent_dir/sub_dir/post.htm –> myblog.com/sub_dir/post.htm
Thanks!

http://ww.wp.xz.cn/extend/plugins/wp-no-category-base/