Lot streaming is the process of splitting a given lot or job to allow the overlapping of successive operations in multi-stage manufacturing systems, thereby reducing the makespan of the corresponding schedule. In this research, we propose a heuristic method for discrete lot streaming with variable sublots. This method consists of two procedures: (1) determine a continuous solution (sublots with real values) for variable lot streaming and (2) derive a discrete solution by rounding up the continuous solution. One sample description is presented for demonstration purposes. The results show the proposed method outperforms discrete lot streaming with consistent sublots.