Hi Aamir,
It is not recommended to move data between different version of Service Desk.
You can upgrade the Service Desk from 12.9 to 17.1 by swing box method.
Then, the next questions for you:
- How do you handle the rest of active tickets like still open incident and request? If these tickets can be closed, you can archive and purge the closed tickets.
- How do you handle the open change orders but they are not these 400 Change Orders? If you can close these non 400 target change orders, you can also archive and purge the closed change orders.
After the above two cleaning the data, the upgraded Service Desk would have 400 change orders, all contacts, all problem category, all Request category, Configuration items, etc. It should not have any active Incidents or Requests. In the change orders table have 400 target change orders with corresponding workflow tasks.
The above two tasks (upgrade and clean unwanted data) are not a simple but it is the way to do that.
Regards,
Derek