Any Best Practice advice for migrating FSGs from 12.1instance to a 12.2 instance with a different fl

Hello -

We are migrating a 12.1 ledger which has its own unique flexfield structure (8 segments) to a 12.2 ledger which has a different flexfield structure (10 segments).

We are trying to figure out the best way to create hundreds of Financial Statement Generator (FSGs) currently setup and used in the 12.1 ledger, in the new 12.2 ledger.  Our thought at this point is to extract the column, row, content sets,calculations, row orders from the 12.1 instance into spreadsheets.  Review and make any updates accordingly.  Is there any way to upload or import them automatically using FNDLOAD or anything else?  Or does it have to be done manually?