Geometry creation!

Hi Dear G4 user!
I’m a beginner on G4 software, I’m trying to learn how create some geometries.
now I would like to build several daughter volume in a mother volume, and I’m not able. could someone have one or more syntaxes that can help me ? and from which I can draw inspiration.

Check exampleB1 and try to modify the class

Ok thanks for you answer M. idrissi_abdelghani.