A subdomain will give you a page such as newsletter.example.com, or finances.example.com.
These pages can also be accessed by typing in example.com/newsletter, or example.com/finances.
From the main page in CPanel, click on the Subdomains link. This can be found under the Domains header.
Enter the prefix for the subdomain, then click the create button.
This will create the subdomain for you, as well as a folder. This folder will have the same name as the prefix, and will be where you upload files for this subdomain.