Step 1: Go to the "Invoices" Tab in the left navigation bar. You can also delete invoices from a single unit from the Invoices list on the Unit Detail Page.

Step 2:  Select the check box next to the invoice(s) you wish to delete

Step 3: Click "Actions," then select "Delete" to remove the entire invoice, or click "Delete Remainder" to delete the unpaid portion of the invoice.

Note: To delete an invoice that has already been paid, you need to click on the "All Invoices" tab instead of the "Outstanding Invoices" tab.