When working with white ink choose the workflow that best fits your needs from three main approaches:
Printer Flood Fill Mode - uses the Printer Flood Fill Configuration.
ONYX Spot Layer Tool - generate the white spot data in ONYX Thrive.
Spot Data (pre-defined) - spot data is created in image editing applications such as Adobe Illustrator, InDesign, or Photoshop.
See Create Spot Data in Adobe Illustrator or Create Spot Data in Photoshop.