My client is on an old server running PHP 5.2.17, should I encourage him to upgrade to 5.3 or will it be ok?


Question: Can Subgroups be created in Gitlab?
Answer: No, it's not currently supported to create subgroups in Gitlab.  (Note that this is also not supported in most other Git hosting sites that I know of, including Github, Bitbucket, and Gitorious.)

On my server, our workaround is to use dots in the name, for example "group1.group2".



You could suggest the feature, but I doubt that it will go anywhere unless you sponsor it or find someone to implement it.