To create batch custom invoices you would go to the Billing tab > Overview or Invoices > Create Automated Invoices > Create Custom Invoices. From here, select the class and/or schedule, and/or tag(s). Click Preview when you are done. Select the children in the list and click Create Batch. In this screen you will can change the invoice date and the period start and end date (optional). Then, select the fee from the type from down and add any other additional items you may need. Click Create Invoices when you are done.