Within the template editor, you can set different conditions
controlling how and when an item is displayed.
The following conditions can be set:-
1. Only show an item according to the value of a specified
field, e.g. only show a label used as a heading when the field
it is associated with doesn't have an empty value.
2. Only show an item if an invoice is paid, is unpaid,
or is overdue.
3. Offset the position of an item depending on the
value of a specified field.
4. Show an item if an invoice is printed, is emailed or