You would need to create a stream for each release. When you create a new stream, you would also be required to add components to it. You can pick a specific baseline of components and create the Stream. In a typical development environment, whenever your stream is ready for a release, you can create a snapshot for that release and the stream may be renamed to next release. Creating a snapshot can also create baselines for the components in the stream. At any time, if you need to get the stream of a past release, you can create a new stream from a snapshot of that release.