Hi,
You can define a new logical component which includes the standby system in the landscape chain and replace the present logical component (with QA system) in the present project itself and activate the project IMG for the same and generate a new maintenance cycle for usage and once your system is ready you could again replace the old logical component but there is a drawback that the CD's can get effected if open in the old maintenance cycle. Hence you could complete them and perform the steps.
