You can add application releases and remove them from release trains while editing either a release train or an application release.
In the default implementation of Serena Release Control, associations to release trains can be done only when the release train is in the Planning state.
To associate an application release with a release train:
Navigate to a release train. For example, click Calendar in the toolbar menu and select a release train from the Calendar page.
Click Add Application Release.
Select an application release to add to the release train.