With Ticketed or Multi-Event registration, you can set limit per Ticket or Sub-Event type.
STEP BY STEP INSTRUCTIONS:
1. Go to Setup > Registration and choose Ticketed or Multi-Event registration.
2. Go to the Tickets or Subevents tab and set up your Ticket / Tickets or Subevents.
3. For each Ticket / Subevent, set a maximum quantity.
To set a maximum quantity across Ticket types:
1. Go to Setup > Registration > Advanced, and scroll down to Max Ticket Sales. Here, you can set the maximum number of tickets to be sold across all Ticket / Subevent types.