Branching an eclipse project and jazz

In order to have multiple streams loaded into the same Eclipse workspace, you need to load multiple repository workspaces (one for each stream) into that Eclipse workspace.   You will of course be fighting against Eclipse when you do so, since Eclipse as an IDE wants you to have one configuration of a give project loaded, or else it is ambiguous which configuration's definitions should be used by all the semantic operations of the IDE (for example, running a debug session ... which configuration of that project should be invoked by the debugger).   So those error messages about loading a project that is already loaded aren't coming from RTC ... they are coming from Eclipse.  There are of course various games that can be played, involving massaging the project names so they are distinct, but if those games involve modifying the contents of files on disk, you will need to be careful not to deliver those modifications to the stream.   Some folks use .jazzignore files to help with that.   But more commonly, people will just use more than one Eclipse workspace ... one for each stream (that is certainly the simplest approach, since you don't have to fight with Eclipse to do so).

There are several articles regarding streams.   This article talks specifically about multiple streams.   Or search on "stream" in the Library