New branch of bug can be created. Sometimes can happen that bug was entered into more specific branch that it should have been entered. In such situations it should be possible to branch just one bug report. User can find bugs in specified branch. Users should be able to find all open bugs in their installed version.
Managers are interested in fixed bugs for particular patch etc.
User's View User's view of the bug-branching depends on the depth of its support. Each branch of a bug has its own bug number. One branch of the same bug is associated with other branches through field like Other Branches similar to Depends on field. Bug can be modified in given branch by editing bug with Version set to specified branch. Bug can be entered into some branch by setting correct Version.