XSI 6 - Character Key Sets / Sub-Key Sets

A note about using Character Sub-Key Sets -- in order to create or edit a sub-key set you need to set the current Key Set or Sub Key Set first -- this is the last item of the Character Key menu -- if you don't do this and try creating character sub-key sets (after "selecting" the set that you want to add it under) either nothing will happen or you will get an error message that says Type was nothing -- if you open the script editor log you'll see this (which is a clue that the character set is missing from the command, and that "selecting" it, isn't what you need to do):
' INFO : Must receive Character Set as first parameter
' INFO : Type was Nothing

Here is a screengrab :