Please note the difference between:

$a={NUM_NULL => 0,
    DISTINCT => 150,
    NUM_ROWS => 2000};
$b={PRO_NUMBER => $a };
$c={AC_SHIPMENT => $b};
%Profileshoh = (IC_STAGE => $c );
[download]

and

$a={NUM_NULL => 0,
    DISTINCT => 150,
    NUM_ROWS => 2000};
$b={PRO_NUMBER => {%$a} };
$c={AC_SHIPMENT => {%$b}};
%Profileshoh = (IC_STAGE => {%$c} );
[download]

In the first case you share the data between the hashes.
In the second case each hash have it's own data