A new template can be added by viewing templates and selecting "add new template" from the top right corner.
Give the template a unique name
Category is effectively the same as the table and the choices are:
The category is for your own reference and all will be available regardless of what table you're in.
This will determine when the template will display:
When the template is for an email, the subject will be inserted.
This is the body text that will be inserted