We use the Release Roadmap to schedule as a Gantt chart to schedule and create dependencies between features. Since a release can contain a lot of features, we bundle related tasks into Master Releases. We would like to be able to filter by Master Release within that roadmap to make organization and scheduling easier.
Thank you for your idea. This is currently possible using the Release name filter. Within this filter you will find your master releases under the product line that they are associated with. Once you have selected the master release, all sub-releases will be included by default.