Hello naeemfirdous,
you can unmanage the transaction during the time the page is non operational. You can either schedule a one time unmanage window on the website on the Manage Transactions page. Or there is an Unmanage Scheduling Utility which will allow you to schedule a periodic unmanage window. It can be found in start menu under Programs > Solarwinds Orion > Advanced features > Unmanage Scheduling Utility.
Let me know if you have any questions.