Like how someone else said, for the top of the awning, install the Archimedes pluggin for a small wave on the bottom
For the bottom with the half-cylinders, size it so it will fit the awning size of one column when cut in half. When you do that, spawn a square part. Put the square part one the top half of the cylinder and size it. Size it so it will cut the whole top half. Negate that rectangle. Last, select the cylinder and rectangle and click Union in the model section.
Once that is done, reposition it.
Tell me if I explained in a sloppy way. Good luck!