We present studies performed by the LHCb experiment with beauty to open charmed meson decays B → Dh(h ( ) ), h ( ) = π, K. Using the 1 fb −1 results of B ± → (hh ( ) ) D h ± , 1 fb −1 results of B ± → (K ∓ π ± π + π − ) D h ± and 1 fb −1 + 2 fb −1 results of model-independent Dalitz plot analysis of B ± → (K S hh) D K ± modes, γ is constrained to be (67 ± 12) • . Further LHCb measurements with multi-body B or D decays are presented in the proceeding. The results include the model-dependent

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... rements of B ± → (K S hh) D K ± and the CP violation measurements of B ± → (K S Kπ) D h ± and B → (hh ( ) ) D K * 0 .