If your account is hosted on a cPanel server, you’ll want to add the domain as a Domain Alias in cPanel. This allows the domain to map to public_html, the directory where the WordPress site is installed.
WordPress Network Admin
Next, you need to change the site URL within the Network Admin > Sites > Edit section.
Click Edit under the site you want to change…
Finally, you’ll put in the new domain under Site Address (URL) and click Save Changes
The process is slightly different when working with a Reclaim Cloud environment. ** Please note: If you are running any type of Single Sign On (SSO) methods with your WordPress Multisite, you may run into issues. This guide assumes there is no SSO configuration.
First, you’ll need to note the IP address of the environment, public or private.
Once the DNS is updated, you can follow the steps listed in the Network Admin section above.
Next, you’ll want to add the domain to the environment so that you can issue an SSL certificate if the site is forcing HTTPS. This is done as an Addon within the environment.
Once that’s complete, the site should load over the new domain!