To create a new task inside a Work Order that is already in the Project:
Inside the Work Order simply go to Tasks/Parts > New from Project > select the white box next to the task you want in the pop-up window > Add Selected Tasks. This task will now show up in your task list inside that work order and in the project.
To create a new task inside a Project:
Open the Project Details > in the right hand corner click Tasks/Parts > New Task. Here you can enter in a task that pertains to this project, attach a punch list, choose a specific location, assign it, add notes, and more.