Thanks Apero,

The way you suggested can resolve the method calling issue. But this won't able to the make the {Parent} attributes shareable in different constructors in Lite in my case.

That said, with my Lite class, I might have

  $admin = MyTest::Lite -> asAdmin( $id );
  $user = MyTest::Lite -> asUser( $id );
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where a data dump will give something like:

  $admin => {
    Mode => 'Admin',
    CommonParentAttributes => {...}
  }, MyTest::Lite
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and

  $user => {
    Mode => 'User', 
    CommonParentAttributes => {...}
  }, MyTest::Lite
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I don't actually mind if Mode is written into the CommonParentAttributes (thus I don't need CommomParentAttributes at all) , but when $user is created, $admin's Mode will become 'User'