What is Zerodha CM BP ID?

what is zerodha cm bp id? i have taken zerodha csdl DP service… but now i transfer my exciting holding shares NSDL to zerodha CDSL DP… by online.

If you’re transferring shares from your NSDL account to your CDSL account, you’ll have to initiate an off market transfer for which you don’t need the CMBP Id. You’ll need the CMBP Id for doing On market trades only, ie transferring shares to your broker in case there’s an payin obligation.