Yes, that is correct. The program does not offer options to print an invoice when you sell, it will only manage your stock. If you need to print invoices, I would recommend you to link Inventoria with Express invoice. Express Invoice will allow you to create and print invoice and Inventoria will manage your stock levels. You can install the trial version here: https://www.nchsoftware.com/invoice/eisetup.exe
To sync both programs: https://www.nchsoftware.com/inventory/kb/1289.html