how to Replace Block?

Hi

I create a library(simulink->file->new->library) and I have a model that containt a bloc that I want to replace it with my library. how can i replace this bloc?

thanks

[Kaustubha Govind]

Achraf: Please continue the discussion on your duplicate question: http://www.mathworks.com/matlabcentral/answers/74814-how-can-i-replace-a-block