WordPress CPT Url metabox collection

you can add a parameter with a new rewrite rule like that :

add_action("init", function () {

    add_rewrite_tag("%countryName%", "([^&]+)");

    add_rewrite_rule(
          "^company/([^/]*)/country/([^/]*)/?"
        , 'index.php?company=$matches[1]&countryName=$matches[2]'
        , "top"
    );


});

After adding this code, flush the rewrite rules of WordPress.

Then you can use URL like http://example.com/company/company-abc/country/UK
And then in the template, you retrieve the parameter with get_query_var("countryName", NULL)