The darn editing process can be rough, don't you agree? We writers create such great proses, at least in our minds, that it becomes difficult if not not impossible for us to let them go. The attachment is akin to when children run off to college and the parents just don't want to let them leave the nest. Alas, we must let them go in order to bring our manuscripts to fruition. Our documents must be culled of paragraphs or even full pages, in some cases, that just do not fit the overall scheme of the book's plot.
It is hard though, I admit this trouble has found its way to me as well. I will create a whole backdrop and later have to refine or discard it due to newer ideas that pop into my head. Ideas that truly do fit better, and drive the story to the climax I have envisioned. This is not to say that my original idea was bad, but that it no longer adheres well to the flow or line I have developed for the story.
So what do we do with those old discarded pages? We cut and paste the best of the phrases; we cherish and savor them. The combination of words that we had sewn together will get adopted as we do our best to squeeze them into the new passages and ideas. It becomes an adaptation of the orginal concept. If you had a great fight scene in a bar, but the bar no longer fits as a proper locale, then you keep the fight sequence and place it into another scene like maybe a warehouse. I know I'm not alone in this concept. Afterall it is not plagiarism to copy and reuse one's own work; nor is it wrong to covet our 'children' to never get thrown away.