Creating FTP acount for a specific folder on the server

You can create additional FTP accounts in cPanel in the FTP Accounts section under the Files category.

When creating a new account you can specify a directory, this will be the top level directory that user will be able to access.  For example if you set the directory to be:

/home/username/public_html/test

The user would not be able to access the public_html folder.