currently in the event module you can indicate a number for the tickets to be sold. However, if an event has VIP and General Admission tickets (and both ticket types have a certain capacity), if I were to put "500" in as the number of tickets sold, I would have to watch like a hawk to make sure each category didn't go over their limit. It would be great to be able to set a limit such as VIP tickets - 300; General Admission tickets - 200