Please see my response to your question on the Network 54 forum.
FDM is really intended to perform data loads from a source system than move data around within the cube.
Your requirement is somewhat ambiguous and it sounds like you want to move a specific piece of data that resides within the planning cube already rather than make all future data load like this. Presuming this is a one time activity you may consider using a calc script/business rule.
You will find that may people use both forums and posting to one is a more effective way to rely on people answering your queries.