To export your settings, right click on the Library icon (the one with the picture of books) and then choose Export. You can only export your settings to an empty folder each time you export. (Suggestion to the creator of Calibre: It would be nice if you could overwrite your previous settings each time you do an export...)
Use the same icon to import settings whenever you need to import them.
To export any Transform rules (under Look and Feel), there is a button at the bottom of the Transform window. This export will allow you to overwrite the previous "rules" file. An import button is also at the bottom of that window.
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