Ticket packages cannot be created inside activities

Open Events → Events → select your event → Edit Event → Ticketing for event packages. Edit Event → Activities → select the activity → Ticketing contains individual activity ticket types.

The event's Ticketing section supports ticket packages. Activities have ordinary ticket types, but the activity editor does not offer package creation. Creating a package at event level does not make it available as an activity package. Use ordinary activity ticketing if individual tickets meet the need, or retain the package in event Ticketing and explain the related activity in event content. Do not assume a nested activity package.