By default and industry standard, BOLs for delivered orders are always attached to Invoices whenever they are sent - whether they are emailed or faxed.
To disable this function, simply uncheck the "Attach BOL to Invoices" checkbox on the Settings page in the dashboard. This choice will remain in effect as long as this box is unchecked, and can be changed at any time by a dashboard user. Note: remember to press "save" at the bottom of the screen to implement this change.
If you need Help or further assistance, please contact Support chat on the bottom right of the screen.