def vcum(self, key="", **kwargs):
    """Allows array parameter results to add to existing results.

    APDL Command: *VCUM

    Parameters
    ----------
    key
        Accumulation key:

        Overwrite results. - Add results to the current value of the results parameter.

    Notes
    -----
    Allows results from certain *VXX and *MXX operations to overwrite or
    add to existing results.  The cumulative operation is of the form:

    ParR = ParR + ParR(Previous)

    The cumulative setting is reset to the default (overwrite) after each
    *VXX or *MXX operation.  Use *VSTAT to list settings.

    This command is valid in any processor.
    """
    command = f"*VCUM,{key}"
    return self.run(command, **kwargs)