You typically create changelists when checking in updated files, but you can also create them when:
1. Expand the Changelist options in the action dialog box.
2. Select <New Changelist> from the <file action> as part of the following changelist list.
The Name Changelist dialog box opens when you perform the action.
3. Enter a New changelist name.
4. Click Attach to attach the changelist to items in TestTrack or an external issue tracking tool. See Attaching source files to TestTrack items or Attaching source files to external issues.
5. Click OK.
The changelist is created and the action is added to it. The changelist is pending and the action is not performed until you commit the changelist. See Committing pending changelists.