Help with BPMN diagram

Hello everyone,

i am really new to BPMN and i have this specific question.
I am creating a diagram about a metal workshop which takes initial parts and then processes them based on the number of processes they require. In the beginning the diagram is the same for all parts(delivery triggers etc.) but when it comes to processes based on part name, the operation changes. Do i need to specify every different operation like(milling, assembly, etc.) on the diagram or is there another way to tackle with this issue(like sub processes)?

thank you in advance