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my %hash = ( 'A1' => { 
                               'B1' => 'Value',
                               'B2' => { 
...
                                       }
                              },
                     )

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if (exists $hash{'A1'}{'B2'}{'C1'}) {
    push ( @{ $hash{'A1'}{'B2'}{'C1'}}, arrayitem4;
} else {
    $hash{'A1'}{'B2'} = {'C1' => [arrayitem1]};
}