Using changelists for an organization
So far we've only talked about the default changelist associated with a workspace. However, workspaces can have one or more pending changelists in addition to their default changelist. Among other uses, these additional pending changelists provide a mechanism for organizing your work in progress.
For example, separate pending changelists might be used to organize the files involved in separate bug fixes. A less obvious organizational technique is to use pending changelists as file action notepads. For example, you might need to modify files to insert temporary trace features. Collecting all of the check out actions for these files in a separate changelist makes them easy to identify and revert.
Pending changelists ...