For business process modeling, we can choose between graph-oriented and block-oriented languages. Block-oriented languages are more structured and therefore better understandable for domain experts, while graph-oriented languages allow more modeling freedom and technical versatility for process designers. To bridge this gap between understandability and technical versatility, we propose a participative forward engineering approach. It uses our block-oriented CUTA4BPM language to support high level process modeling together with domain experts, while graph-oriented BPMN is used for further detailed process design and automation. To support smooth transition from the high level modeling step to the detailed one, CUTA4BPM process models are automatically transformed to BPMN models using model driven engineering techniques.