Right, Wally. The multi-quote feature will only give you a reply page with entire quotations from each post that you chose. It's useful for responding to multiple people in one reply (instead of replying to these people with separate posts).

It is not intended to do multiple quotes from one single person. As John said above, if you want to do multiple quotes from a single person's reply, you have to quote their entire reply, and then bust it up manually in your reply, by inserting the quote tags as appropriate.

Or, there's another way to do it...

You can go to the reply screen without quoting anybody. To insert selected quotes from previous posts, just scroll down until you find the post you're looking for (note that it will only show you the previous 10 replies from that screen). Take your mouse and highlight the text you want to reply to. Then hit CTRL-C on your keyboard. This will copy the text. Scroll back up to your reply box and click to put your cursor back in there. Then hit CTRL-V. This pastes the text into the box.

However, it will only be bare text. To turn it into a quote, you must either manually add the quote tags before and after it, or highlight the text which you just inserted and hit the button on the toolbar that adds the quote tags for you.

This button is only available on the advanced reply screen (not the quick-reply box). It looks like a little cartoon text cloud with tiny words in it. Hover your mouse over these buttons at the top of the reply box until you find the one that says "Wrap [QUOTE] tags around selected text". When you hit this button, having highlighted the text in your reply box, it will automatically add the tags for you.

So you can use this button to save yourself from having to type in the tags all the time. Just go select the text you want from a previous post, copy and paste it into your reply, highlight that text, and hit the button I described, and you'll have a quote. Do this as many times as you wish in your reply.