The most common mix-up โ a subdomain is a whole new site, an alias is another name for the same one
| Subdomain | Extra domain (alias) | |
|---|---|---|
| Example | shop.example.com | example.net showing the same site as example.com |
| Files | Its own separate folder | Shares the main site's folder |
| Database | Its own | Shared |
| System user / PHP pool | Separate | Shared |
| Counts against the plan | Counts as one website | Counts as an alias |
| Use when | You want a genuinely separate site โ a shop, a staging copy | You want several domains to open the same site |
Open the main site (the apex domain) โ Subdomains tab. Type the label, e.g. api, and pick a type and database exactly as you would for a new site โ because it is one.
api in the parent zone pointing at 157.254.192.88.Open the site โ Extra domains tab, enter the domain and add it; www. is added for you. Each added domain still needs its own DNS pointing at 157.254.192.88, and a certificate that covers the new name.