Automotive industry expediting progress toward electrification since climate change driven by global warming represents a significant environmental challenge with far-reaching implications. While electric vehicles offer considerable potential for mitigating CO₂ emissions, their elevated upfront costs pose a notable challenge to large-scale market penetration. Hybrid electric vehicles can serve as an effective intermediary solution, bridging the gap between conventional internal combustion engine vehicles and fully electric vehicles, owing to their comparatively lower initial costs. Hybrid electric vehicle component selection is a complex process which has to fulfil multiple requirements fuel economy, performance, drivability, packaging, total cost of ownership of vehicle and comfort. In addition, Hybrid configuration selection also plays a vital role in cost of hybrid electric vehicle. Hence, it is a great challenge to select right powertrain configuration including architecture selection (P1, P2, P3 and P4), Motor and overall gear ratio to achieve better overall performance compared to conventional vehicle constraints and targets. This study focuses on principle used for selecting an E-Drive system comprising Motor, transmission and overall gear ratio for Hybrid Electric Vehicles in heavy commercial vehicle (HCV) segment. The automotive market in India is analysed and the Heavy commercial vehicle segment selected to specify hybrid powertrain configuration. The principle is based on vehicle performance, design, cost and efficiency requirements. The simulation are done to estimate motor torque/power requirements & overall gear ratio meeting the vehicle target and constraints. Based on the analysis, a comparative matrix consisting of various parameters for heavy commercial vehicle (HCV) application is established. The analysed results and established comparative matrix conclude that 1. Heavy Commercial Vehicles require high torque capability at low speed of E-Drive system with deeper gear ratios, lower max speed of the system and overall lower cost. For similar Power rating, Motors with high peak torque are costlier compared to lower peak torque motors used in passenger vehicles. 2. P4/P3 hybrid electric configuration can fulfil the requirement of heavy commercial vehicle which requires high voltage system greater than equal to 660 V due to higher torque requirements and gear ratio constraints due to integration results into higher powertrain cost. 3. Hybrid electric heavy commercial vehicles can adopt P2 hybrid configurations to fulfil the high torque requirements with 55-60% low torque axial motors where lower HV system (~400 V) architecture becomes feasible to reduce overall powertrain cost. 4. Better Performance and fuel economy can be achieved compared to Conventional vehicle with hybrid electric powertrain Thus E-Drive system selection measure sets guidelines and helps in identifying the best suitable configuration selection for Hybrid electric Commercial applications with low cost solutions. Key Words - Commercial EV, Hybrid Electric Vehicle, E Drive selection, Voltage system Trade off, Targets & Constraints, Performance, Packaging constraints, Efficiency, Design limit.