SubScreen For MM01

Hi All,

I'm a n abaper & I need to add a subscreen tab to MM01 Transaction and include some new fields in it.I made a search & found out some tcodes like omt3b,omt3c etc.But i didn't get the steps like where to start from.

Please let me know the steps for creating sub screen in standard MM01 T Code.

Appreciate any help regarding this .

Thanks & Regards,

Ravi S.