Tylrwnzl got it... for quite a while now I've been following the process below:
1) Start a new post by adding a few blank lines (to prevent loss of ability to type below a quote)
2) Go back and re-find the desired post (sometimes a few pages back)
3) Once found, dig around in that post and find the desired text all over again
4) Highlight and Copy the text when found
5) Paste the Copied text into the previously created Quote-Box
6) Type comments below it
7) Repeat as necessary
Another alternative has been to
1) Quote the entire post
2) Add many 'protective' blank lines below it (prevent loss of ability to type below Quote-Box)
3) Add several new Quote-Boxes below the original Quote-Box
4) Delete text up to the point of the first desired clipping
5) Cut all the text beyond the desired clipping
6) Paste all the Cut text into the next Quote-Box
7) Delete unnecessary text down to the second clipping of interest
8) Cut further text beyond the end of that second clipping
9) Paste into the third Quote-Box
10) Continue as needed (to keep a reasonable quote/response appearance)
Of course - if you want the "originally posted by" element added you've also got to manually add a blank second line in each new Quote-Box before you try to insert that element as it will otherwise cause problems when you try to Copy and Paste it in front of existing text.
Yep, it's a long, ugly, inconvenient process but it's the only way to get this new software to produce what vBulletin and most other Forum software is able to do easily.
Is it any wonder why so many people just type their own comments inside an existing (long) Quote and just change the color of the text they add?
Is it any wonder why so many of us now limit our time and effort to participate here?