For your next threads, please help us keeping things organised and clean. I know it's not your priority but it really simplify our work here.

• Q&A New Functionality.
• How to Post Questions especially the tagging part.

I've added the tags and marked this thread as a question so when you considered it as solved, please change the state

Nothing more to add, thanks @zipit for you answer

Cheers,
Manuel

at least I am not aware of any functionality of CSO in this regard. I also do not think that Cinema has such a function at all (but I might be wrong about this). You will have to clone your materials manually and relink them. Something like the following:

import c4d

def clone_and_relink_materials(node):
    """Clones all unique materials assigned to an object and sets the links to the the cloned materials in the respective material tags.

    Args:
        node (``c4d.BaseObject``): The object to clone the materials for.
    
    Returns:
        tuple[bool, list[c4d.BaseMaterial]]: If the cloning has been successful and the cloned materials.
    """
    # Get out if node is not a BaseObject.
    if not isinstance(node, c4d.BaseObject):
        return False, []

    # A hashmap for the materials and the document the node is attached to.
    clones = {}
    doc = node.GetDocument()
    # Go over all tags of the object.
    for tag in node.GetTags():
        # Step over non-material tags and material tags that do not have a
        # material.
        if not tag.CheckType(c4d.Ttexture):
            continue
        elif tag[c4d.TEXTURETAG_MATERIAL] is None:
            continue

        # Get the material and hash it, so that we can keep track of which
        # material has been cloned and which not (in case there are multiple
        # material tags referencing the same material).
        material = tag[c4d.TEXTURETAG_MATERIAL]
        nid = material.FindUniqueID(c4d.MAXON_CREATOR_ID)
        # This a newly encountered material (in this object)
        if nid not in clones:
            # Clone the material, change its name and insert it into the
            # document.
            clone = material.GetClone(c4d.COPYFLAGS_NONE)
            clone.SetName(clone.GetName() + "_clone")
            doc.InsertMaterial(clone)
            clones[nid] = clone
        # Get the cloned material for the material referenced in the
        # material tag and set the reference in the material tag to the
        # clone.
        tag[c4d.TEXTURETAG_MATERIAL] = clones[nid]
        tag.Message(c4d.MSG_UPDATE)
    return True, clones.values()
        
def main():
    success, materials = clone_and_relink_materials(op)
    print "success:", success
    print "cloned materials:", materials
    c4d.EventAdd()

if __name__=='__main__':
    main()

Note that this solution is not material-tag agnostic, i.e. will not work in any environment that does not rely on Ttexture tags to assign materials to an object.

Cheers,
zipit