Configuring apache2 without aliases or directory

Hi, I need to configure check_mk to work on a subdomain, without aliases or directories.

I did the deb installation of the RAW edition and create my site.

The site is this http://172.26.10.1/mysite/check_mk

I am creating a subdomain checkmk.example.com and I want to display it on the domain.

How to do it? I have all the apache’s configuration on /omd/sites/mysite but cannot find the aliases part.

Do I need to use .htaccess? If yes, where do I have to put it?

Cannot find any documentation online

thanks

anyone can help me please?