Hi Naimboockear39
Thank you for your request.
Yes, that is possible. As soon as your annual GA has expired, you can buy a GA monthly travelcard and contact us at 0848 44 66 88 (CHF 0.08/min) directly. We can linked the GA Travelcard for Duos manually.
As an alternative, you can go directly to one of our stations.
For more information, you can also contact us by chat.
I wish you a nice Sunday.
Kind regards
NicolasK