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$::Config->{group1}->{opt1} = 'A';
$::Config->{group1}->{opt2} = 'B';
$::Config->{group1}->{opt3} = 'C';
$::Config->{group2}->{opt1} = 'D';

$::Config->{group1}->{opt3} = 'C2';
$::Config->{group2}->{opt2} = 'E';

$::Config = {
    group1 => {
...
        opt1 => 'D',
    },
};

$::Config = {
    group1 => {
...
        opt1 => 'E',
    },
};