Ummmm, I thought I sent you one.......
However, Ghost will not separate it per se. If the art is CMYK in Coreldraw, just output each piece (C M Y K) to a postscript file (in the instructions) and then open each file in Ghost to print to film. Voila!
Add Registration marks in Corel using the "Registration" Color Palette so it puts the reg marks on all 4 pieces at the same time.