CityGrows makes it easy to move a field within a section or between sections on the same step. (There is no way to drag a field to a new step - if you need to move a field from one step to another it may make sense to make a new version or duplicate the whole step if the field has a complex configuration of answers that were typed in rather than uploaded from a spreadsheet).
But sometimes it's hard to move a field with a lot of answers within the same step.
Pro tip: make sure the answer section is "closed" by clicking on another field so the list of answers isn't visible. That will make it much easier to drag the field to the placement you want. Just click on the up/ down arrows to the right of the field. Here's a quick video that demonstrates this tip: