so that I am clear your looking to migrate from the ASA 5585 to FTD on a Firepower 4140? And your asking if the Migration Tool will copy all your rules over or if you need to take something into account with regards to modifying rules etc before the migration? here are some possible useful resources around the Migration Tool. The Migration guide and Release notes. I am not the expert but I can try to find one to help answer further questions if needed.
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