@Farhan Amir17 Italiarail is not offering rail pass services. Since these passes are now digital, our website is unable to book the passholder fares. We are ONLY selling point-to-point tickets. You can book seat reservations on:
https://www.raileurope.com/en/destinations/passes/eurail-global-pass18
If you are having trouble booking I would recommend reaching out to Interrail/Eurail directly