You have to deploy your project to an internal Maven repository. To do that, you first need to configure a Maven repository server (I recommend using Apache Archiva), and then point your pom.xml and settings.xml to the server: http://archiva.apache.org/docs/1.4-M3/userguide/deploy.html
After deploying it, you can point all the projects from your company to use that pom as parent pom. You can use the same strategy to create internal project dependencies. That goes very well in a continuous integration environment.