The Data Migration Framework for Microsoft Dynamics AX 2012 is an extension that helps you migrate data into Microsoft Dynamics AX. Examples of the data that you can migrate include master data, open stock, and balances.
The Data Migration Framework is available from the InformationSource services download page.
Data Migration Framework User Guide [AX 2012]
It appears a separate module in your menu (like a module area).
I will try to install and give an update when possible.