Need to add new Transportation Group in Sales/General Plant

Hello All,

I have a question regarding Transportation group in MMR. By default there are two transportation groups in Material Master record for Sales/General Plant

0001(on pallets) and 0002(In Liquid form). Now i want to add new Transportation Group 0003(Frames) and 0004(Container) . Now please guide me how to add these two groups are there any prerequisites for transportation groups. which t-code should i use.