[Koha] Modify Patron Transaction Invoices and Fee Receipts

Dear members, I'd like to modify the Patron Transaction Invoices and Fee Receipts. In fact all the print options available on the Patron Screen (Summary, Slip, Quick Slip, Overdues, Check In Slip) I can't identify them in the Notices and Slips Tool Please provide support. With best regards, Naveen Ali ITM-JE (EAKL) Inst Representative for HEC Digital Library Resources. NEDUET, Karachi.