Hi Andrew,
Thank you for your question! It is possible to add 3-4 project templates into a single project or a set of tasks can be saved under a milestone template. We have a great article about templates, please refer to the following: http://usermanual.clarizen.com/11-1-templates-overview
For further clarification, we suggest you register for one of our daily Q&A webinars (see the link-> http://www.clarizen.com/resources/online-demo.html#second ).These are great resources for free consulting with our Customer Success Managers and visual answers to your questions. We will walk through this in a much faster manner.
All the best,
Diana