How to add new redirection on wordpress site

To redirect just those 3 URLs (with variable ticket number) on the support subdomain then you can do something like the following before the WordPress front-controller (assuming the support subdomain resolves to the same place and is probably handled by WP) using mod_rewrite, in the root .htaccess file:

RewriteCond %{HTTP_HOST} ^support\.example\.com [NC]
RewriteRule ^((?:a/)?ticket/\d+)?$ https://support.example1.com/$0 [R=302,L]

Change to a 301 (permanent) redirect only when you are sure it’s working OK.

Note that this doesn’t specifically redirect HTTP to HTTPS.

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