How to make a default www.website with a website

Hello,
I would like a website to be a www.website ; I tried alias creation but redirect to website by default instead of www.website ; I would like the default url to be accessed with subdomain “www” included by default.

When you create a normal website (without www) www version is already catered. Don’t explicitly specify www

In fact it is a WordPress configuration option, so it es easy to set to www subdomain by default.