Search for the unit owner using the text field.  Alternatively, you can add a new owner/customer by clicking on the new owner link. After locating or creating the unit owner, click on the Select button.

The unit number and description fields are required.  All other fields are optional.  The Advanced section at the bottom can be expanded to enter engine, transmission, and rear axle details. Click Save / Exit at the bottom of the screen to finish adding the new unit.