Hi Marv, there are a couple of different ways - you could create a sphere and then draw a horizontal line in the front view and trim the sphere by the line to make a dimple surface, or you could rotate your arc you have there by 90 degrees in the Front view, and then run the Construct > Revolve command. In the Revolve command, set the Angle to 180 and uncheck "Cap ends" before placing the axis points:








Or another way is to draw a 90 degree arc in the front view and revolve it by 360 degrees to make your hemisphere.




If you don't need to make a hemisphere, I'll probably need to see a clearer image because the one you posted above seems very fuzzy and I can't really see anything there.

- Michael