See the following topics for detailed information about merging changes across streams:
About Merging Streams
Simple Three-Way Merge
Merging Changes across Streams
Merging Changes from a Baseline into a Stream
Merging Changes from Requests Owned by Another Stream
Merging Specific Changes between Streams
Silently Merging a Child Stream into a Mainline Stream
Merging Conflicts across Streams
Synchronizing Streams
Merging Changes from a Baseline or Stream Version
Merging Subfolders between Streams
Merging Changes Related to a Request from another Stream
Stream Merge FAQS