Maybe a dumb question...
 

...but is it possible to quote a post, that occurs in one thread, in a post in another thread; or to multi-quote posts occurring in different threads in one of those, or even in a new one? If so, could anyone explain to this technotwit how? TIA

Yes, you can. If you click the multi-quote button (the small button with the quotation mark symbol) on a post or posts, then start a new post in another thread, under the message box, you'll see a line that says:

The "Quote this post as well" part is hyperlinked and clicking it will bring the quoted posts into the body of the message.

Fango

what about copy-paste quote....it should work?

Yes, but lazybones that I am, I wanted a one-button method that preserved the format you get when quoting a post intra-thread; thanks though (and thanks to Fango for the first answer!).