To modify virtual hosts configuration on account level basis, we can use includes as documented by WHM under the generated httpd.conf

First, ssh as root and do:

sudo nano /etc/httpd/conf/httpd.conf

Locate the virtual host for the account (ctrl + w to search) and find the comment for the location to create the includes.

Create the directory for the given location

mkdir -p <location>

Create the .conf file to be included

nano <filename.conf>

Update vhosts

/scripts/verify_vhost_includes
/scripts/ensure_vhost_includes –all-users