In Corel, how do you overlap colors? I don't want the colors to but up against each other. Sorry about the rough description, but I'm not formillair with the proper terms.
im not a corel expert but i think if you draw a black box and then draw a smaller red box inside the black box, the red box overlaps (sits on top) of the black box.
Are you wanting to trap your separations? If so create an outline around your objects that you want to trap over other objects. Change the outlie color to the same color as the fill. Right click the object and check overprint outline.
Overlapping 
