You can add Belongings to appointments in several places.
There is an icon on the dashboard and schedules if the pet has belongings.
On the dashboard, click on the '...' and click Belongings.
On the individual schedules, click on the '...' and hit Belongings.
On the pet card, click on Appointments, click on '...' and click Belongings.
Open the appointment and click the Belongings button.
You can print the Belongings report under Boarding, Reports, Belongings.