When you create a new custom template you can add objects to the template and configure the object or group of objects as a Genie.
Configure the Genie using substitution strings (%) for the relevant properties of each object. (If you have default values for any property, you can add the default values to the native objects.)
Save the new template.
When you subsequently create a new page based on the template, double-click the Genie and a single dialog will appear prompting you for the value or values of the substitution strings used in the template. This is how the templates for trending and SPC were created.