I highly doubt that EA has time to write a full tutorial on how to clone/add new objects - and even if they did, it wouldn't be of any use to 90% of us as it would be code/resource gibberish to us "commoners" - unless, as Inge asked, you're trying to make a tool of some kind?
Otherwise, give it some time. Again, as Inge said, people are working on it. I'm sure tools will be released once they are stable enough to actually function properly and for the average person to use without breaking everything. :)
Playing on an HP Z800: 2x 6-core Intel Xeon X5660s, 48GB RAM, 4GB nVidia GTX 970
Alienware R4 17: i7 6700HQ, 16GB RAM, 8GB NVidia GTX 1070
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Otherwise, give it some time. Again, as Inge said, people are working on it. I'm sure tools will be released once they are stable enough to actually function properly and for the average person to use without breaking everything. :)
Alienware R4 17: i7 6700HQ, 16GB RAM, 8GB NVidia GTX 1070