I am new to this site so I apologize if this isn't the forum for this question.  I'm using CorelDraw 11.  I'm designing a brochure for a customer who wants to keep it as a 2 color job. How do I use 2 PMS colors in the same object - blue & yellow to make green - and not have it change to a 4 color process when it goes to print?  

I'm not sure you'll get the result you expect,but you can make a duplicate of your object directly over the top and set it to overprint. In v11 you cannot see the effect, this was introduced in X3 I think. Be warned though a Pantone blue with a Pantone yellow overprint will NOT give you green.This feature can be used with good effect for say a process blue base with a tint of black as an overprint making it slightly darker. Experimenting with tints of the same colour can give varying effects but you will need a newer version of Draw to see what will print.

Alan D