Have you ever made something? You know, sewn a dress, quilted, or even, say, built a house? I've done a bit of all these things, and while I've done my share of unpicking, remodeling, and pulling out nails, I seem to do way more editing (remodeling) in my articles and books. What's worse, I've rarely, if ever, wished I hadn't unpicked that seam or pulled out that nail, but I've frequently wished I hadn't deleted a certain paragraph or sentence so soon.
When such a scenario happened during my early writing years, my only option was to groan and move on. Not anymore. Now I keep two files up on my screen. One is the piece I'm working on, and the other is one I title, "(Name of article or book) Misc." Then, when I'm writing, or especially when I'm editing, and I decide to remove a section (especially a large section), I transfer it to the misc file and save it.
I can't tell you how much calmer and easier this simple process has made my writing life. True, "Misc" ends up being a large file of stuff I'll never use, but there have been MANY times I've pulled things--including entire scenes--from it and either reused it or reworked it somewhere else in the piece. It's been a true lifesaver.
I bet it would be for you, too. If you try it.