3. First, create a DNS register in your domain control panel for cp.mycompany.com (DNS type A)
Now you can access to you sentora panel in cp.mycompany.com.
1. In your sentora panel, create a new domain for mycompany.com, next, create DNSs for the domain in DNS Manager.
Now, when you put mycompany.com in your browser you will see your site, not your panel login.
2. In sentora, you can't transfer a domain, but maybe can create the client account and transfer the files of the site from the zadmin folder to the client folder with FTP or SSH. (this case for html files only, the email and ftp accounts, databases, etc. have to be created again in the client panel).
[Sorry my bad english]
Now you can access to you sentora panel in cp.mycompany.com.
1. In your sentora panel, create a new domain for mycompany.com, next, create DNSs for the domain in DNS Manager.
Now, when you put mycompany.com in your browser you will see your site, not your panel login.
2. In sentora, you can't transfer a domain, but maybe can create the client account and transfer the files of the site from the zadmin folder to the client folder with FTP or SSH. (this case for html files only, the email and ftp accounts, databases, etc. have to be created again in the client panel).
[Sorry my bad english]