You can allow users to use their own configuration file for AwStats in case they are in need of customizations not provided by the server’s main config. To enable this option, add the following to /etc/stats.conf:

allow_awstats_include=1

Alternatively, you can go to WHM > Statistics Software Configuration, and click on Allow Awstats configuration Include file

This will allow users to have an awstats.conf.include file in /home/$username/tmp/awstats, which can be used to override settings from the main AwStats configuration for the server.