have a GPO in your forest that you need to migrate to another forest.
The GPO assigns a number of user rights assignments to a group in your
forest. You need to ensure that these user rights assignments are
migrated to a group in the other forest.
Solution: Create a migration table.
To create a migration table, perform the following steps:
Log on to a domain controller or a member computer that has Windows Server 2008 RSAT installed.
Click Start, click Administrative Tools, and then click Group Policy Management.
In the console tree, right-click the domains node and click Open Migration Table Editor. The Migration Table Editor, shown in Figure 1, will open.
Figure 1. The Migration Table Editor.
Right-click the cell below the Source Name column and click Browse.
On the Select User, Computer, or Group window, shown in Figure 2, type the name of the user, computer, or group in the source domain; then click OK.
Figure 2. The Select User, Computer, or Group window.
If required, modify the type of object by using the drop-down list in the Source Type column.
Type the name of the destination object in the Destination Name column, as shown in Figure 3.
Figure 3. The Migration Table.
Select File from the menu, and click Save.
Enter a name to use to save the migration table, and click Save.