I recently changed my Wordpress category structure a bit, changing some of the names and placing some under different parent categories. I don't use category name in my post URLs, so that's not a problem. But my category archive pages are indexed and have page rank I don't want to lose. So I need to redirect: "/category/old_cat_name" to "/category/new_cat_name". Or in some cases to /new_cat_name/new_sub_cat. I gather that I can't do this though the WP Redirection plugin and that I have to modify my .htaccess. Can someone show me what lines to add there--or is there another better way to do this? Thanks.