To do this task
To use the new letter template:
Click Use Template to start using this new letter template now.
If you're editing an invoice letter template, click Finish.
To use this letter template later, click this type of letter in the Letters and Envelopes wizard, click the recipients, and then click this letter template.
To use a new invoice template later, click the invoice you want to work on, click the Letters button, and then click the template from the list.