Hi

How do I set up domain aliases so 3 domains point to my main domain? So i can move my multi-site WordPress site

I have mymaindomain.co.uk, with myseconddomain.co.uk, mythiddomain.co.uk working in multisite configuration with mymaindomain.co.uk as the main site

When I try to add a cname to mymaindomain.co.uk it apends the mymaindomain.co.uk to the end as if its a subdomain. I.e. myseconddomain.co.uk.mymaindomain.co.uk

Is it a cname that i need?