If you look at the bottom right of any post questions or responce,there is a reply box, click it then you can add your own comments. Is this what you mean? Ps, i have just re read you post and i dont think my responce was what your were after, sorry disregard my last.
Instead of using the "Post Reply" button at the top left of a thread, click on the "Reply" button within a post. That will automatically quote the original poster's text, just like you see above.
It would be helpful if I actually read other posts carefully. Sjb, if I'm going to quote from multiple posts, I cut and paste while composing a message. In the composing screen, scroll down a bit and you'll see all the responses in the thread. Cut & Paste to your heart's content. Before submitting, place {quote} in front and {/quote} at end of each section of text (use square brackets instead of the curly braces I had to use). Brad