This study, based on the conservation of resources (COR) theory, explores the impact of contextual variables, such as prosocial motivation, on employee discretionary behavior and organizational commitment. The mediating mechanism of managerial support at work defines the nature of the proposed relationships. Data from 303 administrative, instructional, and supervisory staff—predominantly male (95%) and with an average age of 30 years—working on Technical and Vocational Education and Training (TVET) for Pakistan’s public sector were collected and analyzed by employing SPSS version 24. Confirmatory factor analyses suggested a good fit model, while a correlation matrix provided a significant and positive effect of prosocial motivation on employee citizenship behaviour and organizational commitment. Managerial support mediated the relationship between prosocial motivation and the employees’ organizational commitment and citizenship behaviour. The theoretical and practical implications discussed in this study seek to guide the management area to promote managerial support for better outcomes. These outcomes have considerable tactical, statistical, and real-world inferences for the stakeholders of the TVET sector.