The Create Template… command opens the 「Create New Template」 dialog that allows you to create a template with the same dimensions and color space as the current image. A dialog pops up, which asks you to name the new template. Then the template is saved and becomes available in the New Image dialog. If you give a name that already exists, GIMP generates a unique name by appending a number to it. You can use the Templates dialog to modify or delete templates.