New-TimeSpan -Start (get-process rdpconsole).StartTime
On your source domain in Group Policy Management Console, select the policy(ies) that you want to transfer. Copy them to a shared location which both domains can see--or use a thumb drive to copy to your destination DC
In your destination domain in Group Policy Management Console.
"the trick is, that you need to create a empty GPO first. Then you can right click on the empty GPO and select import, which allows you to import the GPO settings. Browse to the folde where the settings are located."
https://social.technet.microsoft.com/Forums/en-US/a3b6cb52-0f7f-40e1-a311-cfa99b34a2ef/gpos-and-importingrestoring-from-a-backup?forum=winserverGP