There may be times you need to add additional disk space to the server and you want to store accounts on this additional disk. This can be done through the WHM interface.
Once you've mounted an additional disk to your filesystem, you'll be able to configure it in "WHM / Basic WebHost Manager® Setup."
The two values that control this are:
Enter the location where you wish for new users’ home directories to be created
Additional home directories matching the following value will also be used for new home directory creations.
The first option accepts a directory path, and will be the default directory used for new account creations.
The second value can be optionally used to allow account creation or movement between multiple directories matching a particular pattern.