Disable lowerarm rotates Y axis as its hand

For Default, the whole lowerarm follow Y axis rotation of it’s hand. It actually break my avatar lowerarm joint. I want to make smooth transition hand to upperarm twist. In order to do that forearm should stay in still while hand is turning. Anyone who know how to do this please let me know how to do this. Thanks.

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You have to use constraints to do so.

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