I've been trying to move computers that join in dsfw using iManager2.7 but unsuccessful. I dont have much info why it can't be done. Recently i tried it using MMC and it can be moved. So i transferred it in other container and can still login without re-joining to domain. Now I also tried moving it to other dsfw child domain successfully using netdom utility of microsoft. I hope someone have tried it and would be kind to share any info or problem that may arise.

For MMC, its just a drag and drop.
For netdom, download netdom.exe utility.On command line:
Let say you want to transfer a PC to other domain.
netdom move /DOMAIN:dev PC /USERD:dev\administrator /PASSWORDD:domainPassword