In QuickBooks Online, you can create templates for recurring transactions. Your mortgage could be considered a bill if you are referring to a commercial building for your business but I always recommend checking with your accountant. Here's what you'll do to set this up:
Go to Settings.
Under Lists, select Recurring transactions.
Select New.
Select the type of transaction to create, and then select OK.
Enter a Template name.
Choose a Type: Scheduled, Unscheduled, or Reminder.
Complete the remaining fields and select Savetemplate.
If you're creating a Scheduled or Reminder type of recurring template:
If you're creating an Invoice template, specify that it should include unbilled charges and automatically send emails.
If you're using Merchant Services, determine if your customer can pay you online by selecting/clearing the checkboxes for Credit Card and Bank Transfer in the Online Payment section.