Extra Stages
By default, StepMania automatally selects the extra stage songs depending on the song group of the last normal song you picked.
Or, you can manually specify an extra stages for a song group by creating .CRS file in the song's group folder. Place the files "extra1.crs" and "extra2.crs" in the song group folder. For example:
-- Songs
|-- My Group
|-- My Song 1
|-- (song files)
|-- My Song 2
|-- (song files)
|-- extra1.crs
|-- extra2.crs
When it comes time to play an extra stage, StepMania will select the first song in the .crs file. Don't forget to specify modifiers for the song too (see the CRS File Format).
Don't forget: extra stage CRS files belong in the song group folder (e.g. "Songs/Vib Ribbon/"), not in "Courses".

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