Sharon,
One of my organizations has a wiki on Google Sites. Is it possible to
transfer a wiki?
It is certainly possible to copy/paste content from one wiki page to another. But there could be formatting issues that you'll need to clean up if the receiving wiki has very different capabilities than the original.
It has been mentioned that copy/paste from PDF documents into a Groups.io wiki can cause relatively severe problems with the resulting page. But wiki's are basically HTML inside, so I would expect them to be more compatible with each other than any wiki would be with something like PDF or DOC (completely different kinds of page description languages).
I haven't heard any mention of Mark building a tool to do something like that automatically.
Shal
Shal Farley