A project template can provide predefined content, rules, and formatting for your project. PowerDesigner provides a set of predefined templates, and you can also create your own.
For example, in data modeling you could use a CDM-LDM-PDM template, in object-oriented modeling, you could use a template containing the OOM diagrams required for your particular methodology, or in Enterprise Architecture modeling, you could use a template that supports FEAF, or another methodology through a framework diagram or matrix.
When you create a project template, the project (.prj) and the models and files it contains are copied to the template directory. If any documents are outside the project and only attached to it they will not be copied to the template directory.