Repository Management with Nexus
19.2. Repositories per Project/Team
The first and most obvious way to support multiple teams is to configure a pair of repositories per team (one release, one snapshot). The team is then given the appropriate C.R.U.D. permissions and they are able to use the system for their artifacts.
Our http://oss.sonatype.org instance is for the most part configured in this manner, where each project like Jetty has their own repositories separate from everyone else.