Where is %domain_aliases% being defined?

I use CWP 6.

The file /usr/local/cwpsrv/htdocs/resources/conf/web_servers/vhosts/httpd/default.tpl
starts with

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<VirtualHost %ip%:%apache_port%>
ServerName %domain_idn%
%domain_aliases%
ServerAdmin webmaster@%domain%
DocumentRoot %docroot%
Which is then converted to something like

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<VirtualHost 111.222.333.444:8181>
ServerName EXAMPLE.COM
ServerAlias www.EXAMPLE.COM
ServerAdmin webmaster@EXAMPLE.COM
DocumentRoot /home/xxxxxx/public_html/EXAMPLE.COM
My question is about the line

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%domain_aliases% which defines the "www". Where can I adjust this or add more subdomains than "www"? And by adding subdomains I mean simple aliases just like www.

Thank you.