In this case, your custom domain will look like
https://chedule.yourbusiness.comLog in to your Porkbun dashboard
Go to Account -> Domain Management
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Hover on the domain name you want to connect and click on the DNS link that appears below it
Hover on your preferred domain name and click DNS Select CNAME as the Type
Fill the Host, Answer/Value and TTL fields as seen on the custom domain setting page on NeetoCal.
Click on the Add button
For more information, refer to the official documentation.