You can add objects in the animation creator and duplicate by hand the values of the existing slide object. This works under Express License, too.
If you own a licensed version you can add an object in the same level and then you switch to the tree window. You look for the drawsurrogate node in the attribute branch of the ASRS. There you copy the slide node and insert it into your created object node.
If you have already inserted a similar structure of objects in the animation creator, you can copy the attributes of the slider objects to your objects by the Tool Edit Selected Objects from the main menu View or Edit, currently I am not sure about the menu location.
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