It is possible to grand premium access to several chatrooms with just a single billing plan. In other words, the user who purchases this plan unlocks multiple premium chatrooms.
To achieve this, create the billing plan (eg. PRO Plan) and then Assign it to all the chatrooms you want to grand access.
Navigate to Dashboard → Chatrooms → #Chatroom Name → Billing for each chatroom and enable the Assign option.
1) Assign the PRO Plan to the first chatroom:
2) Assign the PRO Plan to the second chatroom:
With the above set-up a member with a single purchase of the PRO Plan will unlock both #Trading Floor and #Market Analysis chatrooms.
Finally, the team member will be presented with the following billing option: