To add new ambulance call go to Ambulance module and  click on + Add Ambulance Call button. Here select Patient Name from dropdown ( or click on + New Patient button to add new patient or Enter Case ID so patient details will auto fill here) then enter Vehicle Model, Driver Name, Date, and Charge Category, Charge Name, Standard Charge, Note and click on Save & Print or Save button.

You can check Ambulance Call created record at Ambulance Call list page.