...
In order to get Blesta to load companies at the hostnames specified under [Settings] > [System] > Companies, it's necessary to point each hostname to the same document root. For example, if you have Blesta installed at /var/www/html/, then each virtual host should point to this location. Each virtual host may have it's own IP address and SSL certificate, but they must all be on the same server, and point to the same document root. You'll also need to make sure the proper DNS records exist to point the hostnames to the correct IP address, typically this will be an A record.
We suggest when using multi-company, you use subdomains for your Blesta installation, otherwise it will not be possible to have different website content at each hostname.
...