Single step and Two step in TMG

You can select either one step or two step. Assign Screen numbers (To assign Screen numbers click on the button 'Find Scr no'. It will propose screen no's)

Then Create. Save 

Single step: Only overview screen is created i.e. the Table Maintenance Program will have only one screen where you can add, delete or edit records. 

Two step: Two screens namely the overview screen and Single screen are created. The user can see the key fields in the first screen and can further go on to edit further details.