Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Clones
MDATA_CLONE_CNTParameter: Offset
MDATA_CLONE_OFFSETParameter: Holes
MDATA_CLONE_HOLESParameter: Scale
MDATA_CLONE_SCALEParameter: Axis
MDATA_CLONE_AXISParameter: Rotation
MDATA_CLONE_ROTATIONParameter: Move Var.
MDATA_CLONE_LOCALMOVEParameter: Scale Var.
MDATA_CLONE_LOCALSCALEParameter: Rot. Var.
MDATA_CLONE_LOCALROTATEParameter: Uniform Scale
MDATA_CLONE_KEEPFORM