What you do is press the Quote button. That does insert the whole original message into your response box, and then you just delete anything you don't want (taking care keep the whole set of < quote > around the text you want to quote).
I didnt know you felt like that about titles.
I nearly always use a title, especially if someone has answered something specific or referred to something else, but it is never intended to exclude anyone.
If I wanted to exclude, I`d send a PM.
I shall certainly watch my titles in future.