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How can I add a subdomain for a specific country?

For example, this is the main domain domain.com
And I added this subdomain libya.domain.com
  You have already added the region,
I adjusted all the settings in the advanced settings, and when I clicked on the specific country, I was not selected for the specific location.
The subdomain file was empty.
In this case what should I do?

You can select what kind of subdomain you want - country, region, city...
Then it eill work for all of selected type.
You cannot mix types.
If you want subdomains for 1 country only, you should do redirects to main domain via htaccess

Happy New Year to the Osclass team! Thank you very much for the response. I don't know much about website development, and I'm not proficient in English. I request your assistance. I have followed all the steps in this guide: https://docs.osclasspoint.com/subdomains-configuration. However, when I select specific countries, I am redirected to an empty file that was automatically created when I added the subdomain *.suqalrahma.com. Please review the attached images. Are these settings correct, or is there an error? The main link to my site is https://suqalrahma.com/

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Hosting wildcard redirect does not work or is not correctly configured as you got to hosting empty page instead of being redirected to main domain.