CA API Developer Portal: Change portal hostnames

Document ID : KB000107730
Last Modified Date : 24/07/2018
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How can the portal hostnames be changed from the default values?
For example: 

Change to: 
This is not currently available as of A feature request exists to added it to a future release.
Details will be posted to the CA Docops page once this has been added will be denoted by the tracking number DE347493 in the release notes.

You would need to setup a new portal sub-domain in case of any conflicts in the environment.