Realize that this is old post but anyone else looking into this might find that import feature works better than pasting (in this case). One would want to import the xml including the GUID back into the brain.
Maybe it's just me BUT... I haven't been able to "copy" thought types from one brain to another in PB 6. I've also been unsuccessful at creating them via an XML file. Attempts to create thought types in either manner will produce the first or last item ONLY.
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