How to limit the total booking tickets for a tour?

Dear Support,

Your theme has a nice feature to limit the number of ticket per booking, but what if I need to limit the total number of tickets available for a tour. And once the total number is reached, the booking for that tour will be disabled (reached the maximum capacity)?
Is this a functionality that can be done somehow in the current theme?
If not, would you be able to develop this feature for us? if yes, how much time will it take you and what would be the cost of it?

Thank you.
Regards