How can use RTC REST interface to add new releases to a RTC project areas

Unfortunately, RTC REST interface doesn't allow the Put operation for timelines and iterations.  This has been answered in the form post below.

Form response to the Put method for iterations
https://jazz.net/forum/questions/92839/405-method-not-allowed-error-on-editing-an-iteration-via-put

Refer to this page what operations are allowed for process.
 
  https://jazz.net/wiki/bin/view/Main/DraftTeamProcessRestApi

I'm afraid PUT operation against iteration is not allowed at this moment. I have already filed this as enhancement request.
  https://jazz.net/jazz/resource/itemName/com.ibm.team.workitem.WorkItem/179352
If this is the case, put your use case or story so that the team can address it.

Thanks a lot for the information. Zachary.