The Detail A & B fields have different names. They are part of the event screen where data goes for the names of a church, place of death, place of burial, and many, many others.
The only method you will have to transfer to FTM is by way of GEDCOM 5.5 it is under "Save As". FTM can NOT read UFT files direct. The Master Genealogist (TMG) has a transfer method that is called GenBridge which does the best job of transfer.