Basically this is a solution of broken link in wordpress. As broken link cause issues in SEO, so you may need to redirect a bulk amount of urls to different url. So here I am sharing you a solution which basically I found working.
Client wanted to redirect all urls ( which was showing 404 error ) containing specific slug ( like category/success-story/) to be redirected to a different URL. Here is the code i used and put it in htaccess file of wordpress root folder.
<IfModule>
RewriteEngine on
RewriteRule ^(.*)url-slug/url-childslug(.*)$ https://www.your-site-url/page/about [L,R=301]
</IfModule>
Just replace the slugs and url as per your requirement.
All About Basic 