Assigning multiple workflows for a workitem in RTC

Can you describe the use case which requires having multiple workflows for a single record type?

In CQ :
  Job (record Type)
      Problem Job [different workflow]
      Standard Job [different workflow]
      Review Job [different workflow]

In RTC
   Job [Workitem type] .
In this there should be an attribute with drop down of "Problem", "Standard" and "Review". Based on this selection appropriate workflow to be selected on click of Save . This is an one time activity while creating the workitem.

I came to know, workflows are assigned to the WI only on click of the first save . In this case, i foresee this is possible .

Note : I understand, another workflow can not be assigned to an already created WI

The workflow is determined by the type category of the work item. To change the workflow you would have to change the type to a type with a different type category with a different workflow assigned. 

I don't really recall multiple workflows can be used for one record type in ClearQuest - the state transition matrix (similar to the workflow in RTC) is definitely static and there is only one for each record type. I believe it is the concept of "dynamic workflow" where some actions can be carried out automatically (behind the scenes) by hooks, and end users it differently in effect. There are no "hooks" in RTC, so you will not be able to achieve the same.

It would be possible to have follow up actions performing state changes during a save.