When you create a Autodesk Inventor file, you use a template to set the measurement units of the file, specify common file properties, and include elements or even content that is common between files.
You can develop as many templates as you need and make them available for creating new files.
When you import AutoCAD or Mechanical Desktop files in Autodesk Inventor, you can choose templates to use in the Import Destination Options dialog box for creating the part, assembly, and drawing files that result.
A drawing becomes a template when you save it in the Templates folder. For example, if you have a drawing file that contains the setup you want to use for other drawings, save a copy of it in the Autodesk\Inventor [revision]\Templates folder. The next time you create a drawing file, the new template is available.