To do this, open the desired invoice that has the status "Overdue" and then open the tab "Reminders".
You can used the button "Set invoice to next reminder level" to create a reminder from the existing invoice to which all of the invoice positions are transferred.
Consult the article "Reminders - Reminders & status 'Overdue'" for information on the reminder levels.
Once the first reminder has been created, you can also print this out directly from within the "Reminders" tab. To do this, right-click on the drop-down field "Actions" and select the action "Reminder with letterhead (PDF)" to create a PDF with the letterhead.
Consult the report "How can I edit a reminder?" for information on how to edit reminders.
We do not have an interface to a debt collection agency. The transfer of invoices must take place outside of bexio.