hi, Can anyone see the below problem. If 1018 (Subprogram Start Definition) and 1019 (Subprogram end definition) not present in (above) 1st operation NCI file and present in 2nd operation in same NCI file. Mastercam automatically assign the 2nd operation value if 1018 not present in 1st operation. Can anyone know how to avoid values of 1018 if not required ? hint : If post seperate operation than no problem But I want to post both operation in single file. Thanks in advance. Regards. Mohsin