I can't see any way to add an Active directory security group. I'm attempting to migrate a WSUS configuration into Ivanti Patch for Windows. The closest I can see is adding an OU, but this would mean ammending my OU structure for Ivanti, which is something I don't want to do. I've also seen other options such as creating text files (yuck) and adding directly into the console.
Thanks for your post. Security groups are not currently supported in Active Directory, only OUs. I would strongly recommend submitting a feature request, or at least voting on similar requests that have already been posted. This link will point you to some similar posts to add your vote to.