Specifically, if you have a large multiple choice question/list/single select that could be used in multiple forms, the only way to copy it over today would be to duplicate the form and then remove any questions you don't want and add new questions etc. But you cannot copy an individual question. This is particularly useful, if you've added imagery to your selections, which can be time-consuming to redo in another question.

A very simple and universal example of this, by be a list of states in a contact form, or a country list.