Actually I think I know where exactly his arm got cut off, I was uncertain at first but seeing that image, made me clear I wasnt seeing things xD
http://www.mangareader.net/bleach/502/9 Right when Byakuya is getting constantly attacked by senbonzakura kageyoshi, theres a panel where only the cherry blossoms are seen and only his arm is seen (I thought it was just him trying to extend his hand but the flurry of senbonzakura pushing him), but if you see clearly it has blood, so thats probably when it got cut off
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