http://technet.microsoft.com/en-us/library/gg712677.aspx
The last step to complete migration is to clean up migration data. You can use the Clean Up Migration Data command after you have stopped gathering data for each source site. This action removes
data about the current source hierarchy from the System Center 2012 Configuration Manager database. This step is optional.
When you clean up migration data, most data about the migration is removed from the database of the destination hierarchy. However, details about migrated objects are retained. With these details, you can use the Migrationworkspace
to configure the hierarchy where the data was migrated from as the current source hierarchy to either resume migration, or to review the objects that you migrated and site ownership of objects.
Justin Chalfant | Blog: setupconfigmgr.com | SCUP Catalog: patchmypc.net/scup | Please mark as helpful/answer if this resovled your issue
