Function create_change_in_sub_module 

pub fn create_change_in_sub_module(
    ito_path: &Path,
    name: &str,
    schema: &str,
    sub_module: &str,
    description: Option<&str>,
) -> Result<CreateChangeResult, CreateError>

Create a new change scoped to a sub-module.

sub_module must be a valid NNN.SS (or NNN.SS_name) identifier. The parent module must already exist; the sub-module directory must exist under modules/NNN_<name>/sub/SS_<name>/.