I've got in a mess with my data types and I want to tidy it all up. Assume I have a document type called 'Big Daddy', which has three children 'Child 1', 'Child 2' & 'Child 3'. 'Child 1' & 'Child 2' have a property called 'propX' and I now realise that I need to add propX to 'Child 3'. Here is a little diagram:

Big Daddy

--Child 1

------propX

------propA

--Child 2

------propX

------propB

--Child 3

------propC

Now, obviously I could just add propX to 'Child 3' but what I should have done originally is add it to 'Big Daddy'. Is there any way to move propX to 'Big Daddy' without losing all the data I currently have?

My initial investigations say no.