In the Lifecycles main window, display the list of lifecycles in the content pane by clicking the top node: 
in the navigation pane.
Click the name link of the lifecycle in the content pane. The Edit Lifecycle dialog box appears.
Select the state for the transition you want to delete in the Lifecycle Model.
Select the transition(s) you want to delete in the Transitions area and click the Delete Transition button: 
You will be prompted with a dialog box asking you to confirm the deletion.
Click OK to delete the transition(s). Any off normal states that no longer have any transitions to or from them will also be removed.