A custom domain can only be used for a single project. For example, by adding mybrand.com to your workspace and publishing a project using it, all traffic going to the custom domain would view the project. It is not possible to publish multiple projects to the same custom domain.
Base domains (mybrand.com) and subdomains (identity.mybrand.com) are considered separate domains. Many people prefer to publish guidelines to subdomains so the base domain can continue to host the brand’s website.
After adding DNS records, make sure not do remove them, even after validation. If either DNS record is removed your published project will eventually not be viewable.
Domains are added to workspaces, so any project within the workspace may use it.

A Plus, Pro, ****or Enterprise Standards plan. Trials cannot add custom domains.
A registered domain with a third-party provider, such as Godaddy or Namecheap.
Access to the DNS records for the domain, often found in the domain account.
The domain provider must allow edits to DNS records.

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