Résumé
This study aimed to optimize the line managers performances in the human resources (HR) division in answering the role of the HR management function problem in Medan City Manufacturing Company. The novelty proposed is a concept of HR management called "Human Resources Professional Transformation". Specifically, this concept discussed the ability of HR division line managers to make adaptive changes to the company's business-oriented functional divisions with managerial competence, commitment, innovation capability, and readiness for changes towards work performance. The population of this research was the line manager of the HR division, totaling 185 respondents. The sampling technique used a probability sampling approach with simple random sampling through the slovin formula, totaling 126 respondents. The analytical tool used is structural equation software through the SmartPLS application program. The results showed that managerial competence, commitment, innovation capability had a positive and significant effect through the HR professional transformation on the performance of line managers in the HR division. Meanwhile, readiness for change has a positive and insignificant effect on the HR Professional Transformation. Readiness for change also has a positive and insignificant effect on the Line Managers Performances in the Human Resources Division through HR Professional Transformation. Based on the suitability test of the research model, it proved that the HR Professional Transformation can answer the problem of the role of the management function to improve the line managers performances in the HR division with managerial competence, commitment, innovation capability, and readiness for change of 0.907.