All project templates can have sub-templates created. This can be done when in the update project details of a project, select 'Create a Project Template' from the options menu.
Sub-templates are useful for setting up the Project Team, Workflows and Tasks, Task Timelines, Project Timelines. Folders and Links.
System admins and users with system wide admin access can edit team templates without being added to the project team.
Next page: Create a new template