Can I transfer DFFs from iExpense to AP to PA Expenditure Items? Can they be context sensitive?

Client needs to capture DFF information on the iExpense line then have that populate AP Lines and/or AP Distribution Lines then to Project Expenditure Items.  Does anyone have a list steps or the appropriate profile option names to move information between these modules?

In addition, does anyone know if the DFFs are required to be Global or might they be Context Sensitive?

Thanks,