How do I pre-fill the device quantity of installed and tested on a fire alarm inspection?

On the iPad, scroll to the ALARM INDICATION APPLIANCES AND CIRCUIT INFORMATION and/or ALARM INITIATING DEVICES AND CIRCUIT INFORMATION section of the inspection

Tap "Autofill" at the top of the section 

>>> Suggestion: wait to tap Autofill until all devices have been inspected 

You will now the number of devices matching each type listed with the number installed (listed on the building) and the number tested (on this inspection)