A hierarchy is possible between events. In the Manage Events page, on the "Conference Slots" tab of the event you would like to make into a subevent, you can choose a main event by title. The conference "Slot" label is a grouping like "Morning Study Sessions", a rough time slot in which each participant will have to select one event to attend. To manage conference slot labels, go to civicrm/admin/conference_slots?group=conference_slot&reset=1.
A hierarchy is possible between events. In the Manage Events page, on the "Conference Slots" tab of the event you would like to make into a subevent, you can choose a main event by title. The conference "Slot" label is a grouping like "Morning Study Sessions", a rough time slot in which each participant will have to select one event to attend. To manage conference slot labels, go to civicrm/admin/conference_slots?group=conference_slot&reset=1.