T Shirt Design: How to Create Color Separations for Screen Printing in CorelDRAW 

GraphicsFlow offers an addon software called Smart Designer that adds features specific for screen printing to CorelDRAW. This would including color separations, trapping, underbase, registration marks. The video shows the manual process. The easiest way to under base in CorelDRAW or Illustrator is to create a copy of the object, convert all outlines to objects, and welding everything together. You can then add a white outline to the image to create a choke, or a black outline to create a spread.