You can include phases, tasks, and checklist items from project templates or checklist templates in operational projects or other templates along with the lower-level project elements that belong to them. The subtrees are copied when you do this.
...
1. In the structure tree in the screen area on the left, select the project element below which or next to which you want to insert a subtree from a template.
2. Select whether you want to create a phase, task, or checklist item and choose Include.
3. Use the search dialog box to choose the project element you require.
The system then includes the selected project element and all its lower-level elements in the structure tree below or next to the project element currently selected.