Can one workspace repository belongs to multiple stream

Jihan,
in the view "Pending Changes" users can select from the context menu "Change Flow Target..." and select another stream. This can be done on Workspace or component level.

Elisabeth

You can flow changes from (accept) or to (deliver) any other stream or repository workspace, assuming you have permissions to. As Elisabeth mentioned, in the Pending Changes view you can select your repository workspace and run the "Change Flow Target..." to compare your repository workspace against another and flow changes between them.

There is a short article which outlines multiple stream development with Jazz.

https://jazz.net/learn/LearnItem.jsp?href=content/docs/source-control/streamdev/index.html