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If a customer has properties defined in the system users that can create shipments will be able to add custom properties when creating template shipments. How properties are set in templates controls whether users can add properties in the create template shipment process. If a template has properties fully set and is then used when creating a shipment the user is not able to add additional properties, the admin has then defined in the template what properties should be used in a shipment that is created with the template. If a template has properties but values are not set the user that creates a shipment with that template is required to set the values of the properties. If a template has no properties and is configured so that the user can set properties the custom properties section will be available for the user that uses the template and he can add whatever properties he wants to the shipment. See chapter above about how to add properties when creating a shipment from template.
Custom properties in single shipment view
If any custom properties are set in a shipment they are displayed in the single shipment view below the standard shipment properties. If there are no properties set for a shipment then the custom properties section in the single shipment view is not displayed.