In CORE, memorized invoices are created using the Recurring Invoices feature. This feature automates the generation of invoices on a set frequency and is commonly used for fixed-contract billing. To memorize an invoice, first create the initial invoice and then set up a recurring schedule, for example, monthly billing for a fixed amount. This applies to both manual invoices and retainer or trust-fund invoices that need to be sent on a regular cycle. You can also create automatic billing schedules for projects so CORE can calculate the bill amount based on billing rules and WIP. Memorized invoices are static, meaning only the date and invoice number update each cycle, while the invoice amount remains fixed as defined in the schedule. All scheduled transactions can be viewed and managed in the Recurring Invoices screen.