If you want to redirect a subdomain to other page, you should follow the next steps:
1. Log into cPanel;
2. Choose the Domains section and select Subdomains;
3. Then select Modify a Subdomain and click the Manage Redirection link;
4. Write the URL, where you wish visitors to be redirected:
For example: http://domain.com/option1
5. Finally, Save it.
Now, when somebody visits the subdomain, he will be automatically redirected to the specified page.