I didn't get your question clearly. However, here are some thoughts from my side.
Do you want to migrate from Vault 2012 to 2013. Then everything is done automatic. Install 2013 and follow the steps, it should take care of it. Just take a full back up of your vault before migrating to 2013 as a safety measure.
If the question is around migrating a 2012 project in Inventor to 2013, you can do that through task scheduler. More information can be found in the help file under task scheduler.
Let me know, if you are looking something different from the above.