When ever you were creating the business logic, we should think about the logic where should be implement this task, which means in process layer. Depend upon business logic it will vary not standard structure, so make sure try to understand the business logic then implement in process.
You can invoked your “Task 1” in ProcessLayer\ProcessTransaction state.
Hi,
I created a video about using the Enhanced REFramework, and it also shows how to call Task1 or the other sub-Frameworks, or Tasks.
Hope this helps: