How to combine a custom object with a custom animation?

I'm trying to make furniture my sims can interact with. I know how to make objects and animations with blender, But I don't know how to link the two so my sims can actually use my custom content.

With blender, I made an object (a couch) and an animation (lying down).  How do I link the two so in game, I click my object, the option to use the object (lie down) is there, I select it, and my sims can interact with the object?

I appreciate any help!