I am able to draw a solid cube:

Draw a square

Extrude the same length

Select all

Group


I can't seem to draw a solid sphere though. Here is what I tried

Draw a circle

Draw a line pole to pole across the circle

Revolve tool

Select a half circle face

Select the line

360

Select All

Group


When I try subtract tool for example, I get Error: "The selected object is non-solid   View details"