How to combine Entities?

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Making an entire book shelf fall with all of its contents has nothing to do with combining objects. The easiest way to make a book shelf fall with all of its contents is to make all the items on the shelves non-static entities. Then you put a script area at the foot of the shelf. The script area will be used to rotate the book shelf around the area in hopes of creating a fall down effect. Then you use RotatePropToSpeed on the shelf, passing in the area that is at the foot of the shelf. Note the book shelf might also need to be made an entity if it isn't already.