Sorry, but as far as i know there are no documented steps, or information provided by Oracle. What i would suggest as a starter is to get on the internet and watch an FDMEE webinar that was done by Tony Scalese at Edwater Ranzal last July. It is still available for viewing on the Edgewater Ranzal website (US not UK), and lasts for about one hour, but gives a high level view on some of the key issues to be considered before venturing into an upgrade.
FDMEE is a combination of the functionality of two products - FDM & ERPi.
FDMEE contains many of the finance focused functionality (say that five times fast) found in FDM, on upgraded architecture.
FDM is available in release 220.127.116.11, and FDMEE is also available. People upgrading to 18.104.22.168 can choose between the two for now - in future releases on FDMEE will be available.
as Jeff stated there is no migration utility yet. It will be released in 22.214.171.124
I'm not sure if there will be import/export XLS capability in 126.96.36.199 PSU2
But currently you will be need to build from scratch and use SQL custom processes to move classic FDM metadata (locations, ...) into FDMEE.
In any case, this is not supported.