Right click into the code generator - a popup menu will be shown from which you can select what to create.
The code generator only adds code to some class - there are no functions to remove code. This needs to be done within your development environment.
The code generator parses the source code of the Java class. Due to this parsing it is not able to e.g. drill down into property classes. Use the Bean Browser to do this. - When changing the source code outside the code generator, then press the "Refresh" icon in order to sync.