Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Set Reference Pose
TCD_EXTRACTRESTPOSE
Parameter: Go to Reference Pose
TCD_APPLYRESTPOSE
Parameter: Extract Skeleton
TCD_EXTRACTSKELETON
Parameter: Add Body Part
TCD_ADDBODYPART
Parameter: Remove Body Part
TCD_REMOVEBODYPART
Parameter: Load Preset...
TCD_LOADPRESET
Parameter: Save Preset...
TCD_SAVEPRESET