Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Checked
TAKEBASE_CHECK
Parameter: Index
TAKEBASE_INDEX
Parameter: Camera
TAKEBASE_CAMERA
Parameter: Render Settings
TAKEBASE_RDATA
Parameter: Override List
TAKEBASE_OVERRIDES
Parameter: Camera
TAKEBASE_CAMERA_COMBO
Parameter: Render Settings
TAKEBASE_RDATA_COMBO
Parameter: Notes
TAKEBASE_NOTES