Config management in Sandbox
Accepted answer
You'll need to create new sandboxes if your old ones are not GC enabled. At the time of my post, I can select the option "6.0.2 RC3 with Configuration Management" when creating CLM sandboxes. QM and RM projects are created as GC already enabled. An added bonus of this option is that now we can access the Manage Project Properties page of RM.