Creating internal boundaries on 2D surface
 

Hello Friends,

I am trying to analyse flow in a 2D nozzle and want to create internal boundaries to set boundary conditions in it. From tutorials I got to know that it can be done by projection the line sketch or slice the surface though I am not sure as I failed to do so while trying these.
I have uploaded the geometry for convenience. If anyone can throw light on it that how I can overcome this problem. Any help will be highly appreciated.