how to navigate to error page(404 or 500) of a respective site

ErrorDocument 404 ${error_doc} Define error_doc /sitename/page-not-found.html

example: If the IN site is clicked then the error page should go to Define error_doc /IN/page-not-found.html

If the OUT site is clicked then the error page should go to Define error_doc /OUT/page-not-found.html

So here the error page redirection should be dynamic as per the site it is called.