The purpose of this research is to reduce the error in the billing to the seller, materials, equipment, office and car repair and reduce the time to set the bill of the seller material. Equipment, office and car repair services. So had to step in and the billing is going in the same direction, and so that the open bill company. Good h AE siamwalla limited, Roger steps or conditions of the bill. The Handbook of the billing and billing, clear and in writing. That implies a thorough billing and billing. To be used as a guide in the implementation of agent billing billing and a pair of hands in the performance of those on bill. Right according to the process and step are proposed. By using the observation data from the bill. And the data from practice. Which the manual was verified by experts and experienced in the field of the bill. The results of this study can be arranged to guide practice. Billings and steps in the bill of material, equipment vendors and service office repair services for the bill and the bill. Good company H AE siamwalla Co., Ltd.The results showed that after the manual operation the bill and steps in the bill of material, equipment vendors and service repair services office This will reduce the problem in the following.The error of the document - incomplete.The bill - mistakes on the wrong day.- documents in the billing errors.- the bill for a long time.
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