Want to mesh 2D wind tunnel (rectangle) in different parts
 

I am meshing the airfoil in a rectangular box. I want to partition the rectanglular box into small small different sizes and mesh it accordingly. I used boolean operation and after that sucked. How to draw the partition lines in design modeler so that it can be used to mesh in Ansys in different parts in a single file.

draw a new sketch .. make lines in sketch as how u want to partition .. use lines from sketches option ... then use projection to split the geom