Apple Numbers '09 - Manual (Page 249)

Chapter 12 Designing Your Own Numbers Spreadsheet Templates 249
Saving a Custom Template
You can save your new template so that it appears in the Template Chooser.
To save a custom template:
1 Choose File > “Save as Template.”
2 Type a name for the template.
3 Make sure the folder named My Templates appears in the Where pop-up menu of the
Save window.
The template is saved in your home folder in the following subfolder structure: Library/
Application Support/iWork/Numbers/Templates/My Templates/. It appears in the My
Templates pane of the Template Chooser.
4 Click Save.
To delete a custom template, in the Finder navigate to the folder in which you saved
the template, and drag the template to the Trash.