How to exclude all the library blocks in a simulink model using mscript?

I have about 100 unit models. I need to exclude all the library blocks in a particular unit model from coverage report by giving some description. I had to do this for all the unit models. Doing this manualy will take alot of time therefore I need a script to automate this task. Can anyone please provide a set of commands through which i can automate this task.