%hash = {
          'chapter' => {
                       'subchap1' => {
                                     'p' => 'sathish is a good bou',
                                     'content' => 'sathish is good boy
+ or not
'
                                   },
                       'content' => 'sathish
'
                     }
        };
%hash1 = {
          'chapter' => {
                       'subchap1' => {
                                     'p' => 'para',
                                     'content' => 'body
'
                                   },
                       'content' => 'head
'
                     }
        };
i want the output as shown below 
%hash= {
          'head'=> {
                       'body' => {
                                     'para' => 'sathish is a good bou'
+,
                                     'content' => 'sathish is good boy
+ or not
'
                                   },
                       'content' => 'sathish
'
                     }
        };
[download]

I'm afraid I don't understand your replace logic.  If p is supposed to be replaced with para (which I presume is because of 'p' => 'para' in hash1), why isn't content meant to be replaced with body, but rather subchap1 with body?