For the current version you will need to follow these steps.
Create a project, import 2 base configurations (Base-FW1, Base-FW2)
Import the 3rd party configuration (review and make edits to the migrated configuration)
Create a snapshot
Merge the migrated objects and policies to Base-FW1
Cleanup the Base-FW1 configuration by deleting the policies that do not need to be added to Base-FW1
After deleting the unneeded policies, remove the unused objects
Generate the XML for Base-FW1 or send the configuration via API
(for Base-FW2)
Load the snapshot
Merge the objects and policies to Base-FW2
Cleanup the Base-FW2 configuration by deleting the policies that do not need to be added to Base-FW2
After deleting the unneeded policies, remove the unused objects
Generate the XML for Base-FW1 or send the configuration via API
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