SCOPIDEA allows administrators to create invoices for clients in order to record sales transactions. Invoices can be created for specific clients by filling out information such as the client's project, name, and address. Invoices include details like a unique ID, client, issue date, due date, currency, and products with descriptions, quantities, unit prices, amounts, taxes, and notes. Users can edit, duplicate, delete, send as thank you, and record payment for invoices in SCOPIDEA.