Yes, you can find more details here.
Please be aware the open ticket is valid for the same route (same direction) and same bus carrier for up to one year. Such open ticket policy varies depending on the specific bus carriers. Please check more details on E-ticket.
Each route and schedule has a unique ID number which appears in the search results as well as on your e-ticket next to the schedule name. It can also be found in the “My Bookings” section of the website next to the schedule name.