How to add animation clip from another model to the model ?

I have a character model, inside this model there is an animation play. I want to add a new animation clip to this model by using the code. I want the animator play two animation clip (for two character difference) in same time and one an animator. Is it possible ?

I remember before i saw on this forum, there is anyone said that : just add an element array to the clip list, then when we play, the Animator will play two or more clips together automatically. But i could not see his article. Please help, thanks.