A template can be enabled or disabled as per requirements. If you do not want to see a particular template while creating quotes or invoices, you can disable them.
To enable/disable the templates:
In the left Navigational Column, click the Sales tab and select Templates from the drop down list.
Under List of Templates section, view the templates.
To enable or disable a template, under the Status column, select Enabled or Disabled from the drop-down list.
Note: After you disable a template, you will be unable to select it while creating a new quote or invoice.