Yes, but apparently it wasn’t framed simply enough for you. Here it is again, broken down. You’ll note that there’s nothing in there about Notepad, and a separate tab (not tabs) only comes into play if you want to put in a nested quote from an old post.
1.) Open a composition window with the appropriate post(s) (multi)quoted.
2.) Copy a piece of text from the post that’s missing a nested quote.
3.) Hit Ctrl+F or the search shortcut in your browser of choice and paste in the text you’ve just copied and search for it.
4.) This should take you further down on the same page with your composition window, in the Topic Review section, to the post you’re quoting.
5.) Highlight the text quoted in that post that you want to include as a nested quote.
6.) Hit “Home” or whatever shortcut your browser uses to take you back to the top of the page.
7.) Place your cursor where you’d like the nested quote, hit the quote tag button, and paste the copied text in the middle. Attribute the quote if you so desire.
Easy as pie. The only time you’ll need to open a separate window is if you’re quoting from something more than 50 posts back; everything else will be in the Thread Review for you.
And I notice that you haven’t responded to how often you actually need to use a nested quote. I haven’t seen anybody complaining, in ATMB or in threads, that they can’t follow the conversation because not enough people are including nested quotes.
ETA: And, as **Ellis Dee **noted, you can simply use the multiquote button for the posts you want to include as nested, which works for all board material.