Adding more Illustrator objects without destroying your existing scene.

You can open as many Illustrator files as you want. From the Object menu use the Open Illustrator File command and pick the new file. If you are working in ProAnimator the new objects will be created and placed on their own track. If you are working in After Effects the new objects will be assigned to Set 1 by default so assign them to a different Set if you want to animate them independently