As per title. How do you effectively copy or create an ID3D11 buffer by copying another ID3D11Buffer?

Specifically I would like to copy a Vertex Shader Constant Buffer.

Any help would be appreciated. Thank you.

What are you trying to achieve because map/memcpy and CopyResource work. But if you are just instancing some data and need the same working data as another object just setting that data might be better solution to begin with. The PCI-E bus transfer might incur some perfromance stalls you don't want.