...
Click Migrate in the navigation menu on the left.
Click Maps.
The page defaults to User maps. Use the menu to select Group maps if you want to create or manage a group map.
Click the create map button.
The corresponding Create map modal opens.
Enter a name for the map you are creating. A name is required in order to save the map.
Select the source and destination connections the map uses.
Select the automatic mapping options you want to use for the map.
Select Click Done to create the map.
Find the map and click Manage mappings.
Use the User mappings or Group mapping page (based on the map type) to add explicit mappings for users and groups on the source to users and groups on the destination. This can be done manually or by importing a mapping file.
Use the Exclusions page to add exclusion mapping for accounts or groups that should be excluded from permission preservation.
...