You can use INVedit to see what items you have and add them to the other worlds.. But thats just the same as ... adding items in.
And as the other guy said, you can use MCEdit to bring over blocks and structures, but not the items themselves.
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i know this is an old topic, but if I see something unanswered that I known answer to, I need to write it place the items u want to copy into chest, and then copy the chest to the other world using MCEdit