Sub-resources (multiple units) track identical items like bikes or rooms. Set in Left Menu > MANAGE > Resources > [Resource Name] > Booking Capacity to ‘Multiple Units’, add each unit one by one. **Automatic assignment: **By default, sub-resources are automatically assigned to clients when they make a booking. **Manual assignment: **Want clients to choose a specific sub-resource themselves (e.g., if someone always prefers Tennis Court 3)? Just toggle on “Allow subresource selection” in the same menu. As an admin, you can always manually assign sub-resources when creating a booking internally. Tip: Use the timeline view in the calendar — it’s especially useful for managing sub-resources, as they appear listed vertically, making availability easy to spot at a glance.