The "quote" button in any given post will automatically quote that post in a new reply on the same thread. Quoting anything else is a bit more manual. But if you just do "post reply" then the reply editor has a "quote" button and you can quote anything you like. Copy the text you want to quote, go to where you want to reply, "post reply", and then
stick the new text into a quote box.
--paulr
 
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