Digital manufacturing (DM), which has developed rapidly in recent years, is premised on use in planning operations, and it is not utilized in production operation. There are many challenges to the application of DM in production operations, such as the incapacity of a supervisor at a work site to effectively implement the manufacturing-line model developed using a DM, in a planning operation. Therefore, we propose a system that makes it possible to redesign work plans and support improvement activity by simply inputting values in accustomed standardized work tables, namely, process capacity tables, standardized work tables, and standardized work combination tables, of three types of workers, instead of inputting a large quantity of complicated parameters. Less examination time is desirable at production sites, and we added a tool that enabled the graphical display of execution processes and results. Moreover, we added a system that made it possible to alter Microsoft Excel database inputs, such as the number or arrangement of DM processing machines. This paper describes the proposed system and its method of implementation.