'-Invoice ' Check rates & check the work of Dumex, Sale. '-Call for customer Bill '-Fill a receipt from customers with the company's document preparation, P'Ya + P'Kae Sent.
'- Invoicing ' - check the work of Dumex check prices Sale '- call customer about Bill ' - fill ใบตอบรับ from customers. Ready prepare documents of the company. P Ya P Kae Sent. ''