What is required to migrate group memberships to the target group?
Domain Migration Administrator 7.x
In order for DMA to migrate group memberships, the member's correct location and information must be in the DMA database. This can be accomplished by migrating the members, first then migrate the groups. Alternatively the members can be migrated during the Groups migration. Simply enable the option Migrate the members of the groups selected on the Groups Options page of the Migrate Groups Wizard.
Mapping information for the members can also be prepopulated in the DMA database via a CSV import. For more information regarding importing mapping information into the DMA database, please refer to the following Knowledge Base article:
NETIQKB9719 - How do I import mapping information for an existing source and target account into the migrated objects table in DMA using a CSV file?