To generate a custom invoice, first navigate to the tenant profile.
Click the menu button
Click the Create Invoice button.
Select custom invoice, and the below will be displayed to you.
Click "Add a new item". Here any services, fees, addons, or insurance will be populated into this drop down menu.
Select the charge that you're wanting to generate an invoice for, and then hit save.
If done correctly, you'll see your custom invoice reflected in the ledger.