This question will display my vast tech ignorance for all the world to see, but I'm getting a little frustrated, so it's okay.

Is there a way to make my bottom margins automatically go to as close to 1 inch as they can?

I've got the normal margins checked, 1 inch top and bottom. But when I do any sort of editing (lately mostly cutting) of the manuscript, invariably I later find some bottom margins that are too large. So I have to scroll through the entire 400 page MS to fix them, due to chain reactions apparently. This is very time-consuming. I'm sure I'm doing something wrong. What I have done is go to the large margins and click off the orphan thingy, then the subsequent page moves up a bit to my large margin. There has to be a better way, right?