. The number that is generated is important for the first part as it allows other posters to click on the original post, but I don't usually bother with it in the rest of a post if I'm splitting things up as it sounds like you want to.
Each statement needs to end with [/{artificial space}quote]. That will finish things.
When I want to do what you're proposing, I'll usually just separate out things, type in these starts & finishes, and then add my thoughts.
Others may have more efficient ways, but that's what works for me.
I hope that this makes sense, TBL. Just remove the {artificial space} in the commands above, including the brackets, and you should get the results that you want. Preview your post to be sure - I wouldn't want to steer you wrong

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ETA (edited to add): in light of your last post, TBL, perhaps this was just babble that you can now disregard.