An easy way to start customizing a template is to copy an existing template and modify it to suit your needs.
Where: Navigator > Resources > Reports > Templates tab
To copy a template:
Select the standard template you want to copy.
Left-click, and drag and drop the selected template into your user folder.
Select Copy from the Drag & Drop Options dialog. A copy of the template is dropped into your user folder.
Alternatively, you can select the template you want to copy in the Navigator and choose Edit > Copy from the menus. Then select your user folder and click paste to drop the template into the folder.