For any item that has multiples (trucks, drivers, etc.), you need to use an index. The system will prompt you.
Here are the steps for mapping trucks: Say we want to map the VIN.
1. Click on the form field where you want the VIN to go
2. From the drop-down menu, select "Vehicle." The system will display something like this:
Vehicle [ ]. The [ ] is where the index goes.
3. So, for the first vehicle, enter "0"
4. Then, from the next drop-down menu, select the item you want mapped, such as the VIN
5. Repeat steps 1-4 for the next item, but this time increment the index to "1", then "2", ... etc.