def create_multi_index(df,index=['SSSCC','GPSLAT','GPSLON','CTDPRS']):
    """
    Changes a normal dataframe to a multiindexed dataframe
    
    Parameters
    ----------
    
    df : DataFrame
         Pandas DataFrame containing indicies to become multi indexed
         
    index : List
            List of columns to be made into multi indexed DataFrame
            
    Returns
    -------
    
    df : DataFrame
        Multi indexed pandas DataFrame
    
    """
    df = df.set_index(index,drop=True)
    return df