@structure = (
   [ # Result from first query.
        { ... },
        { ... },
   ], 
   [ Results from second query 
        [ # first parameter
             { ... }
             { ... }
        ],
        [ # second parameter
             { ... },
             { ... }
        ]
    ],
    [ # results from third query
       [ # first parameter
          { ... }
       ], 
       ...
    ]
);

##</code><code>##

# Total results from all parameters of query 2
# See List::Util qw[ sum ];
my $q2Total = sum @{ $structure[ 1 ] };