Nowcerts uses an index to map items that have more than one object.(vehicles and drivers)
Here are the steps for mapping trucks. say we want to map the VIN
1- click in the form field where you want the VIN to go and from the drop down select Vehicle.
The system will display something like this Vehicle [ ]
The [ ] is where the index goes. so for the first vehicle enter "0". then from the next drop off select the item you want mapped, in our case the VIN.
Repeat this for the second truck but this time increment the index to "1",.. then "2" etc.
Hopefully this helps.