one part, multizone, with interface in between
 

Hi friends,

How can i create a single part(2D) in ICEM CFD consisting of two surface zones with an interface between them as shown in the geometry ? so that i can patch the zones with different fluids and the interface can move. i can do this in design modeller but i need to do this in ICEM CFD in order to get a better mesh.
plz help me.......