What are the best practices for requirements parallel development for multiple releases with-in Rational Requirements Composer 3.0.1.3 under one RRC Tools project?

Concepts

RRC Tools Project

1. Creation of one tools project for all releases
2. Creation of one RRC tools project for each release
3. Is there any tools template that need to be used for multiple releases such as Agile?
4. Paralled requirements is supported using any out of box or custom templae

Organise Requirements

1. Having a separate folder structure for each release?
2. Having one set of folder structure for all releases but identifying requirements using attributes such as release number, release date
3. Tags usage - How it is diferent from attribute?
4. Confirm if multi-list box is supported

Baseline Requirements

1. Creation of approved requirements artefacts baseline using collection
2. Creation of RRC Tools project baseline using snapshots