Hi Andre,
You need to create the custom step type in the station view rather in the sequence file view.
There's a step type button near the Users Button.
Click on this button then proceed in creating the custom step type as you would have done in the sequence file.
If you are using TS 1.0.x then the new step type will be added to the types palette.ini.
If you are using TS 2.0 then will be able generate a new group ini file to hold your custom step types.
Regard
Ray Farmer
Regards
Ray Farmer