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changing attribute type in RTC?

I have a custom workitem in one of the project area. I have 6 attributes whose type is "Iteration"
I would like to change them to "Deliverables".
Are there any easy method to do this? Like making the modifications in process template?
Accepted answer

We've ended up in a similar situation although it was more SmallString vs MediumString .. .and we had to create a new custom attribute of type MediumString, add it to all the work items, sync attributes (to get the new attribute in all the objects), then wrote a tool that copies the value from oldAttribute to newAttribute.
Comments

I though so too.

There where many similar questions. See https://www.google.de/search?q=change+attribute+type+site%3Ajazz.net
Some have messed with the process XML and got lucky. However, it is not a really supported use case.
1 vote

As Susan said, we have had to export/import to change workitem attribute types.
to change from iteration to deliverable there is no transformation that works,
so you will have to manually modify (or clear) the the fields in the csv export
(or not import that field)
1 vote

also to avoid leaving trash behind, we have created a new process template with only the NEW fields. recreated the project from the new template (if not shared, which takes a little more planning) and then imported the data into the new project, leaving behind the old field defs.
rename to old to z- something, archive it. then rename the new to the old project name.
1 vote