Promote option regarding Snapshots in RTC Eclipse
Accepted answer
The question is not quite clear, but here are some points related to this.
If you are talking about within the same repository, then:
-You can create a stream or repository workspace from a snapshot in the Eclipse client. Right-click on the Snapshot and select 'New' --> Workspace or stream.
-You can delete snapshots if you need to (although it doesn't do what your question might imply)
-Deleting a snapshot doesn't really free up any room in the database (snapshots/workspaces/streams) are lightweight objects. A snapshot is a collection of baselines. Baselines, as well as components inside a workspace/stream, are like a reference to a point in time of a 'configuration' (the entire configuration graph [consisting of the versions of all the files, etc.) is stored in the db, and doesn't really have a way to be deleted from Eclipse).
-Snapshots can be 'promoted', but what this means in RTC is not what your question implies. When we say a snapshot can be promoted, really it's just changing the owner of the snapshot, to either a new workspace or stream. This doesn't really do much, except govern where the snapshot can be found (when running queries to show snapshots of a stream for example), or also it may govern who has 'write' access to the snapshot (i.e. which role in the project area can delete or rename a snapshot - where the project area is determined by the owner of the stream for example...).