def METHOD_NAME(self, category, stype="horizons"):
    """Delete one or more horizons or zones categories.
    Args:
        category (str or list): Name(s) of category to make, either
            as a simple string or a list of strings.
        stype (str): 'Super type', in RMS ('horizons' or 'zones').
            Default is 'horizons'
    """
    project = self.project
    categories = []
    if isinstance(category, str):
        categories.append(category)
    else:
        categories.extend(category)
    for catg in categories:
        if stype.lower() == "horizons":
            try:
                del project.horizons.representations[catg]
            except KeyError as kerr:
                if kerr == catg:
                    print(f"Cannot delete {kerr}, does not exist")
        elif stype.lower() == "zones":
            try:
                del project.horizons.representations[catg]
            except KeyError as kerr:
                if kerr == catg:
                    print(f"Cannot delete {kerr}, does not exist")
        else:
            raise ValueError("Wrong stype applied")