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For space merging, please refer to the instructions highlighted here:
When you merge a space containing 1,000 documents, this may take some time to process, but other than that you shouldn't need anything special to get started. Just follow the instructions and while it's processing, you'll see a screen like this:
Once the merge is completed, the destination space (Heroes of Jive, in my example) will house all the old content. The author, creation date, and modification date details do not get modified.
If you want to experiment first, I would recommend creating some test content in two test spaces and see how the process works. Let me know if you have any other questions after you've tested this out.